Patent ID: 6868605

Claim:
A method of manufacturing a bubble-jet type ink-jet printhead using a silicon-on-insulator (SOI) wafer, the method comprising: preparing the SOI wafer having a first substrate, an oxide layer stacked on the first substrate, and a second substrate stacked on the oxide layer; etching the second substrate and forming an adiabatic barrier having a groove defining a heater; forming a heater protective layer on the second substrate for protecting the heater and sealing the adiabatic barrier; forming an electrode electrically connected to the heater on the heater protective layer; etching a bottom side of the first substrate and forming a manifold for supplying ink; sequentially etching the heater protective layer, the second substrate, and the oxide layer on the inside of the heater with a diameter less than that of the heater and forming a nozzle; etching the first substrate exposed by the nozzle and forming an ink chamber having a substantially hemispherical shape; and etching the first substrate and forming an ink channel for supplying ink from the manifold to the ink chamber, wherein the adiabatic barrier is formed along inner and outer circumferences to surround the heater, thereby insulating the heater from another portion of the second substrate and wherein forming the heater protective layer is performed by means of low-pressure chemical vapor deposition so that the adiabatic barrier is maintained substantially in a vacuum state.