Patent ID: 6139131
Filing Date: 2000-10-31
Classification: B41J

Abstract:
A high density drop generator inkjet printhead realizing at least 1200 dpi in at least one direction of printing comprising:a semiconductor substrate with at least one surface, said surface having a predetermined area;a multiplicity of heater resistors disposed on said at least one surface at a density of at least six heater resistors per square millimeter and each heater resistor adapted to eject an ink drop when an energy pulse between 1.0 and 1.4 .mu.joules is applied; anda passivation layer disposed on a portion of said at least one surface of said semiconductor substrate to a thickness having a range of between 3350 .ANG. and 4350 .ANG. over each of said multiplicity of heater resistors thereby avoiding damaging printhead temperatures.