Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1993-12-01
1996-01-02
Burr, Edgar S.
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
395108, 395128, B41J 222
Patent
active
054802407
ABSTRACT:
A print quality enhancement arrangement for a dot matrix printer such as a thermal ink jet printer. The arrangement includes a buffer for receiving 300 dots per inch (dpi) resolution data in the horizontal (print head movement) direction and creates 600 dpi resolution data using image enhancement techniques. The arrangement further includes correction of the higher resolution data to remove pels which are unprintable due to the frequency response of the print elements in the print head. The correction is performed using knowledge of the history of printed pels and the original 300 dpi data. The creation of the higher resolution data and its correction occur "on-the-fly" as data is being fed to the print head, rather than through the creation of a 300 by 600 dpi bitmap.
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Bolash John P.
Breswick Curt P.
Eade Thomas J.
Lane David K.
Mayo Randall D.
Burr Edgar S.
Kelley Steven S.
Lexmark International Inc.
McArdle, Jr. John J.
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