SEALED SLOT INK JET APPARATUS
Original Publication Date: 1989-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
An ink jet writing head comprises an ink filled cavity having a slot sealed with magnetic fluid. The slot is opened locally to permit ejection of an ink drop by subjecting the slot to coincident pressure pulses from suitably positioned piezoelectric transducers. By changing the relative timing of the pressure pulses, different spots along the slot can be opened. The magnetic fluid prevents evaporation of the ink from the slot.