Incremental printing of symbolic information – Ink jet – Ejector mechanism
Patent
1996-08-23
2000-02-08
Barlow, John
Incremental printing of symbolic information
Ink jet
Ejector mechanism
347 10, 347 11, 347 14, 347 19, B41J 2035
Patent
active
06022097&
ABSTRACT:
The invention relates to an ink-jet printer which uses an ink containing fine solid particles of a pigment suspended in a carrier liquid. The print head of the printer has an ink ejection orifice at one end of an ink chamber, and the ink chamber is provided with a first electrode to which a first DC voltage is applied for concentrating the pigment particles in the vicinity of the orifice by electrophoresis and a second electrode to which a second DC voltage in pulse form is applied for ejecting an agglomeration of the pigment particles together with a small amount of carrier liquid from the orifice. In the printer, the length of waiting time, which elapses from the decay of a pulse of the second voltage, is checked. When the waiting time is relatively long, the polarity of the first voltage is inverted to prevent excessive concentration of pigment particles in or in the vicinity of the orifice, and/or the second voltage is modified to promote movement of pigment particles in the vicinity of the second electrode toward the tip of the second electrode.
REFERENCES:
patent: 5204695 (1993-04-01), Tokunaga et al.
patent: 5272490 (1993-12-01), Murano et al.
Patent Abstracts of Japan, vol. 014, No. 416 (M-1021), Sep. 7, 1990 corresponding to JP 02 160557 A (Minolta Camera Co. Ltd), Jun. 20, 1990.
Patent Abstracts of Japan, vol. 005, No. 093 (M-074), Jun. 17, 1981 corresponding to JP 56 040563 A (Ricoh Co Ltd) dated Apr. 16, 1981.
Hagiwara Yoshihiro
Minemoto Hitoshi
Shima Kazuo
Suetsugu Junichi
Uematsu Ryousuke
Annick Christina
Barlow John
NEC Corporation
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