Patent ID: 6273551
Filing Date: 2001-08-14
Classification: B41J

Abstract:
An acoustic inkjet print head comprising:a housing having a plurality of apertures;a sheet of glass substrate having a first and a second opposing surfaces;said sheet of glass substrate being located within said housing;said housing having ink between said first surface of said glass substrate and said plurality of apertures;a plurality of transducers for generating acoustic waves;said plurality of transducers being located on said second surface of said sheet of glass substrate and each corresponding to one of said plurality of apertures;a plurality of fresnel lenses being located on said first surface of said sheet of glass substrate and each corresponding to one of said plurality of apertures and a respective one of said plurality of transducers;each one of said plurality of fresnel lenses focusing said acoustic waves of a respective one of said plurality of transducers through ink onto a respective one of said plurality of apertures;a plurality of control circuits each of which corresponding to one of said plurality of transducers;each one of said plurality of control circuits being electrically connected to a respective one of said plurality of transducers;each one of said plurality of transducers being so constructed and arranged to be responsive to a respective one of said plurality of control circuits to oscillate at a resonance frequency defined by said respective transducer, said respective control circuit, said glass substrate, said fresnel lens, and said ink, wherein each of said plurality of control circuits has a feedback circuit to receive the resonance frequency and feed it back to said respective transducer.