CONTINUOUS STREAM TYPE INK JET ARRAY WITH CALIBRATION INK STREAMS
Original Publication Date: 1987-Dec-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
In the continuous stream ink jet array technology, the use of high voltage deflection fields for substantial droplet deflection is required to calibrate the ink stream array after ink stream start-up from a cold or prolonged shut down condition. Due to temperature and ink property variations coupled with long term droplet generator drift, several reliability problems are encountered with the initial stream operation, whenever substantial droplet deflections are required in order to use a calibration droplet sensor after each ink jet array start-up from a cold start condition. For example, (1) the high voltage deflection plates are usually contaminated by an excessively long breakoff length or satellite droplet merging distance; (2) a stream break-up point upstream of the charge tunnels cause a loss of droplet chargeability; and (3) wide range of stream deflection sensitivity (i.e., droplet deflection per unit charging amplifier voltage) causes difficulty in formulating a reliable ink stream calibration strategy.