Acoustic ink printhead having reflection coating for improved ink drop ejection control

摘要: An acoustic ink printhead having improved drop ejection control includes a substrate an array of lenses at its upper surface for bringing rf waves to predetermined focus and layer acoustically reflective material thickness equal odd multiple one quarter the wavelength passing through it openings corresponding positioned above each lens. Ink from pool is allowed couple opening receiving focussed wave, while isolates interstitial regions between lens by reflecting incident on in those regions.