Patent ID: 7056798

Claim:
A method for manufacturing a semiconductor device in which a plurality of electro-thermal conversion elements and a plurality of insulated gate type field effect transistors for flowing electric currents through said plurality of electro-therinal conversion elements are integrated on a first conductive type semicouductor substrate, said method comprising the steps of: forming a second conductive type first semiconductor region on one principal surface of the first conductive type semiconductor substrate; forming a gate insulator film on said first semiconductor region; forming a first gate electrode on said gate insulator film; doping a first conductive type impurity by utilizing said first gate electrode as a mask; forming a second semiconductor region for providing a channel region of an insulated gate type field effect transistor of said plurality of insulated gate type field effect transistors, by diffusing said first conductive type impurity; and forming a second conductive type source region on the surface side of said second semiconductor region and a second conductive type drain region on the surface side of said first semiconductor region, wherein said source region is formed by utilizing said first gate electrode as a mask such that said source region extends from beneath said first gate electrode to beneath a second gate electrode formed on said gate insulator film, wherein said source region is formed by ion implantation of an impurity from a direction inclined at a predetermined angle from a direction normal to the first conductive type semiconductor substrate, and wherein said drain region is formed with a mask to offset said drain region from said first gate electrode.