Patent ID: 7407273

Claim:
A piezo-driven micro-droplet jet generator, comprising: an ejection seat, having an a discharge hole in a central portion thereof opening to surroundings exterior to said generator, an inlet for liquid, and an ejection chamber, inside said ejection seat, in fluidic communication with said inlet, said ejection chamber containing an ejection plate having a plurality of micro ejection holes and positioned between said ejection chamber and said discharge hole; a base plate fastened to said ejection seat; a membrane between said ejection seat and said base plate, having a front side facing said ejection seat and a rear side, with the membrane touching the ejection plate in a rest state; and a piezoelectric plate, placed at said rear side of said membrane, covering said ejection plate, such that said piezoelectric plate is completely separated from said liquid by said membrane; wherein when electric voltage is applied, said piezoelectric plate vibrates in cantilever bending, during said vibrating movement a gap opens between said membrane and said ejection plate, liquid between said membrane and said ejection plate upon said vibrating movement undergoes pressure, and is ejected through said plurality of micro ejection holes.