Patent ID: 6146914
Filing Date: 2000-11-14
Classification: B41J

Abstract:
A method for fabricating a heater element of a printhead, the method comprising the steps of:(a) forming a resistor on a substrate, the resistor forming steps comprising:(i) forming a first polysilicon layer on a substrate;(ii) heavily doping the polysilicon layer;(iii) removing a central portion of said polysilicon layer to expose the surface of said substrate leaving two end regions of said first polysilicon layer;(iv) forming a second layer of polysilicon which is relatively thinner than said first polysilicon layer over said end regions and over said bare substrate surface to form a thin polysilicon central heater region;(v) doping the central heater region and(vi) processing the heater element to form said two end regions of relatively low resistance polysilicon to function as gates and conductors.