Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
2005-02-08
2005-02-08
Nguyen, Thinh (Department: 2861)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
C347S058000
Reexamination Certificate
active
06851791
ABSTRACT:
This invention relates to a printhead in which a plurality of resistors are selectively activated by an external control circuit to produce the ejection of droplets of ink through nozzles located in correspondence with the resistors. Selection and activation are performed according to a matrix having a plurality of vertical lines corresponding to the number of resistors per group of nozzles and a plurality of horizontal lines corresponding to the number of groups of nozzles in the head. The groups of nozzles in the polychromatic head comprise real nozzles and fictitious nozzles, as a result of which the groups of nozzles have a regular layout, and are uniformly distributed and equivalent to the corresponding layout of a monochromatic head. With this solution, polychromatic heads having the same number and the same disposition of contacts with the external circuit and the same height as a monochromatic head can be manufactured simply.
REFERENCES:
patent: 4864328 (1989-09-01), Fischbeck
patent: 5455610 (1995-10-01), Harrington
patent: 6318846 (2001-11-01), Saul
patent: 34 12 531 (1985-10-01), None
patent: 196 06 854 (1996-09-01), None
patent: 0 739 736 (1996-10-01), None
Patent Abstracts of Japan, vol. 1998, No. 13, Nov. 30, 1998 & JP 10 202876 A (Seiko Epson Corp), Aug. 4, 1998 abstract.
Conta Renato
Menegatti Angelo
Scardovi Alessandro
Banner & Witcoff , Ltd.
Nguyen Thinh
Olivetti Tecnost S.p.A.
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