Miniature ink jet nozzle
AssigneeA. B. Dick Company
InventorRobert I. Keur
Life of this patent
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Abstract
In an ink drop writing system a vibrating nozzle is used to form drops which are thereafter deflected electrostatically whereby characters or wave forms are written on paper by the deflected drops. In order to minimize the variations in drive voltage requirements for the transducer that vibrates the nozzle, caused by changes in ink parameters which cause variations in the velocity of sound through the ink that is used, and in order to minimize variations in the drop separation time from the ink stream, with drive frequency variations, the length of the nozzle is selected so that its mechanical resonance frequency is very much higher than the frequency at which the nozzle is used. As a result, the length of the nozzle is considerably shorter than the nozzle lengths which have been used heretofore.
Claims5
A nozzle for an ink drop writing system having a mechanical resonance frequency which is at least 1.5 times higher than the frequency of operation of the system and a fundamental fluid resonance frequency which is at least 1.06 times higher than the frequency of operation of the system.
Dependencies are inferred from the claim text.