Abstract: A novel structure for a bubble-jet type ink-jet printhead is provided. A substrate is covered with a nozzle plate perforated by a predetermined number of nozzle holes a predetermined distance from said nozzle plate. The structure is surrounded by walls, within which form a common ink chamber. Each nozzle hole has, on the substrate underneath, a set of resistive elements. One of the resistive elements encircles an edge of a nozzle hole while another lyes directly underneath the perforation. During operation of the printhead, the encircling elements form a doughnut-shaped bubble forming an imaginary or virtual chamber within the doughnut from the rest of the common chamber. After formation of the doughnut-shaped bubble, the resister underneath the perforation forms a big bubble which causes ink to be ejected through the nozzle hole. The structure that allows for the above is easy to manufacture, and produces high quality print.