METHOD OF OPERATING INK JET DEVICE

摘要

The volume of ink ejected from the nozzle 202 of an ink jet printing apparatus comprising a chamber 200 and transducer 204 during one cycle of operation for printing a dot upon a recording medium is controlled within that cycle of operation by operating the ink jet apparatus via the application of a pulse train T1 to T4 having a periodicity equivalent to the dominant resonant frequency of the ink jet apparatus. In this way each pulse of the pulse train causes an ink droplet of substantially predictable volume to be ejected at the nozzle 202. A given number of successive pulses during each printing cycle is applied to the ink jet apparatus for causing an equal number of ink droplets to be ejected for controlling the boldness of the dot being printed.