Ink-jet printer and ink jetting method

Details Ink-jet printer and ink jetting method Ink-jet printer and ink jetting method

Filed on

2006-12-14

Date issued

2008-08-12

Examiner

Nguyen, Lamson D. (Department: 2861)

Patent Class

Incremental printing of symbolic information

SubClass

Ink jet

SubSubClass

Controller

Other Related Categories

C347S043000

Type

Reexamination Certificate

Status

active

Patent number

07410234

Description

ABSTRACT:
In an ink-jet head including black, yellow, magenta, cyan nozzle rows, the nozzle rows are arranged so that in each of the nozzle rows, adjacent nozzles are arranged by a predetermined spacing distance P, and that the black nozzle row is shifted in a nozzle-row alignment direction by a spacing distance smaller than the predetermined spacing distance P, with respect to the cyan, magenta and yellow nozzle rows. When a black dot is formed between monochrome-black dots adjacent in the sub-scanning direction, a dot of color-mixed black which is a mixture of the other three colors is formed between the monochrome-black dots. At this time, by adjusting a black-ink jetting amount to be greater than a total amount of the other three color inks, it is possible to make the monochrome-black dot and the color-mixed black dot to be mutually uniform in size.

REFERENCES:
patent: 6084604 (2000-07-01), Moriyama et al.
patent: 2002/0163557 (2002-11-01), Du et al.
patent: 2005/0018012 (2005-01-01), Iwasaki et al.
patent: 3533771 (1997-03-01), None

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