Patent ID: 7931356

Claim:
A nozzle plate for a droplet generator, comprising: a nozzle layer, having a first surface, a second surface, a nozzle and a trench, wherein the nozzle passes through the nozzle layer, the trench is separated from the nozzle by the first surface which surrounds the nozzle and is located in the nozzle layer, the first surface and the second surface which surrounds the trench are coplanar, and a bottom of the trench is deeper inside the nozzle layer than the first surface and the second surface; and a filler, filled and remaining in the trench, wherein a wetting angle of a surface of the filler is different from a wetting angle of the first surface and the second surface of the nozzle layer, and the depth of the filler is substantially equal to the depth of the trench; and wherein the nozzle layer has a recess covering the nozzle and the trench, and the trench is located at the bottom of the recess.