Patent ID: 6161912
Filing Date: 2000-12-19
Classification: B41J

Abstract:
A method of driving an ink-jet recording head comprising at least one nozzle opening, pressure generating chambers each communicating with reservoirs via ink supply ports and having a Helmholtz resonance frequency with a period Tc, and piezo-electric vibrators for expanding and contracting the respective pressure generating chambers, the method thereof comprising:expanding or contracting the pressure generating chamber, thereby generating a vibration at the Helmholtz resonance frequency in an ink meniscus in proximity of the nozzle opening; andapplying a pressure wave to the vibrating ink meniscus to thrust the meniscus vibration from the nozzle opening, thereby jetting an ink droplet fit for printing from the nozzle opening;wherein neither the meniscus vibration nor the pressure wave alone possess sufficient energy to produce the ink droplet fit for printing.