| abstract |
A thermal ink jet printhead with an array of nozzles 3 , each nozzle having heater elements 10 disposed in a bubble forming chamber 7 . The bubble forming chambers 7 having circular cross sections. For example, the chambers 7 are cylindrical, spherical, barrel-shaped or truncated cone shaped. The circular cross sections have enhanced structural strength that better withstands the pressure transients in the bubble forming liquid during droplet ejection. |