Piezoceramic based atomizer for high viscosity liquids

A piezoceramic based atomizer for atomizing a liquid into a form of micro-droplet or mist, comprising:

• a piezoceramic based atomization unit comprising:
• at least one micro-perforated membrane, wherein an individual micro-perforated membrane comprises an upper surface, a lower surface opposite to the upper surface, and one or more micro-holes, the one or more micro-holes linking the upper and lower surfaces for allowing the liquid to penetrate the individual micro-perforated membrane from the lower surface to the upper surface;
• and
• at least one annular piezoceramic configured to vibrate the at least one micro-perforated membrane so as to atomize the liquid at the upper surface of the individual micro-perforated membrane into droplets;
• and
• a liquid absorbing medium having a top surface and a bottom surface opposite to the top surface for absorbing the liquid at the bottom surface and delivering the absorbed liquid to the top surface, wherein the top surface contacts the lower surface of the individual micro-perforated membrane for allowing the absorbed liquid to wet the lower surface of the individual micro-perforated membrane;
• wherein:
• the liquid absorbing medium further comprises at least one sunk area recessed from the top surface, causing the lower surface of the individual micro-perforated membrane not in contact with the top surface over the at least one sunk area;
• and
• the at least one sunk area is disposed underneath the one or more micro-holes of the individual micro-perforated membrane, preventing the one or more micro-holes from pumping the liquid directly from the liquid absorbing medium to thereby balance a liquid feeding speed and an atomization speed, and suppress overheating of the piezoceramic based atomization unit simultaneously.