Ink-jet printer using ink containing pigment particles

Details Ink-jet printer using ink containing pigment particles Ink-jet printer using ink containing pigment particles

1996-08-14

1999-08-17

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 10, 347 11, 347 14, B41J 206

Patent

active

059400986

ABSTRACT:
The invention relates to an ink-jet printer using 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 DC voltage is applied for concentrating the pigment particles in the ink in the vicinity of the orifice by electrophoresis and a second electrode to which a DC voltage in pulse form is applied for ejecting an agglomeration or several agglomerations of the concentrated pigment particles together with a small amount of carrier liquid from the orifice. The rate of migration of the pigment particles depends on the temperature of the ink. For stable ejection of agglomerations of pigment particles, a temperature sensor is disposed in the ink chamber, and the voltage applied to the first electrode is varied according to the detected temperature of the ink.

REFERENCES:
patent: 3914772 (1975-10-01), Kashio
patent: 5272490 (1993-12-01), Murano et al.
Patent Abstracts of Japan, Abstract of JP-A 5-254118.

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