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Abstract

Techniques for improving stable ink droplet ejecting at high speeds and associated ink jet print heads for use in recording apparatuses. Particularly, residual vibration in the elastic, deformable diaphragms used to expel ink from an individual nozzle are dampened or eliminated by applying a secondary driving signal a preselected period of time after the primary ejection signal has been transmitted. Ideally, this secondary signal is applied just when the vibrating diaphragm most closely approaches a stationary wall normally separated therefrom by a predetermined gap distance, at least when electrostatic action is used to deform the diaphragm. Moreover, the secondary driving signal is smaller in magnitude yet longer in duration in the primary ejection signal to insure an orderly dissipation of diaphragm vibration without ejecting undesired satellite drops. Also disclosed are the use of diaphragms having portions of varying thickness and/or surface area in either a discrete or continuous fashion to tailor the diaphragm rigidity and deformation characteristics according to desired operating characteristics.

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First Claim