Recorders – Markers and/or driving means therefor – With ink supply to marker
Patent
1985-11-22
1988-05-24
Hartary, Joseph W.
Recorders
Markers and/or driving means therefor
With ink supply to marker
358298, G01D 1516
Patent
active
047469358
ABSTRACT:
This patent application discloses a method and apparatus useful for eight-level halftone thermal ink jet printing by printing with droplets of ink with volumes weighted in a binary sequence. Three (3) binary-weighted drop generators which are fired in sequence are useful in an eight-level, four color printing process and additionally may be employed with a clear ink vehicle drop generator in order to reduce optical density of single small dots in a given pixel area to thereby reduce grainyness.
This method and apparatus are also adapted for four color printing with a chosen number of rows of binary-weighted drop generators, including untoned vehicle if desired, in order to achieve color printing of pixels having desired color and optical density.
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patent: 4353079 (1982-10-01), Kawanabe
patent: 4490728 (1984-12-01), Vaught
patent: 4494128 (1985-01-01), Vaught
patent: 4499479 (1985-02-01), Lee
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patent: 4540996 (1985-09-01), Saito
patent: 4604654 (1986-08-01), Sakurada
Bethurum William J.
Hartary Joseph W.
Hewlett--Packard Company
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