Method and apparatus for ink drop trajectory control

Details Method and apparatus for ink drop trajectory control Method and apparatus for ink drop trajectory control

1995-05-26

1998-09-15

Lund, Valerie

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 55, B41J 211

Patent

active

058086374

ABSTRACT:
A ferromagnetic ink is formed by a dispersion of ferromagnetic particles mixed with an ink base. Drops of the ink are ejected from an inkjet printhead to print characters or markings onto a print media sheet. To resist clogging printhead nozzles, the dispersed ferromagnetic particles have an average diameter equal to or less than approximately 1/10 of the average nozzle diameter. A magnetic field is applied to the ejected ink drops during printing to direct, or more specifically bias, the ink drops toward the print media. The magnetic "biasing" force aids in maintaining drop shape along the ejection path, and in reducing bounce. As a result, edge roughness and spray are decreased so as to improve print quality. In alternative embodiments, the magnetic field source is formed by a permanent magnet or electromagnet. Such a field source is integral to or adjacent to a printer platen. The field source is located adjacent to the printhead and in several embodiments extends along the scan path of the printhead. In one embodiment the field source is formed on the ink cartridge.

REFERENCES:
patent: 4258371 (1981-03-01), Sekine
patent: 4336546 (1982-06-01), Edwards et al.
patent: 4359752 (1982-11-01), Nakagawa et al.
patent: 4928125 (1990-05-01), Iino
patent: 5382963 (1995-01-01), Ponds et al.
"Laser-Compatible Inkjet Text Printing", by Bohorquez et al., Hewlett Packard Journal, dated Feb. 1994, pp. 9-17.

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