Patent ID: 7947538

Claim:
A method for manufacturing a semiconductor device comprising the steps of: forming an insulating film on a semiconductor layer; forming a first conductive film on the insulating film; forming a second conductive film on the first conductive film; forming a resist pattern on the second conductive film having end portions and a middle portion that are thicker than remaining portions of the resist pattern from a cross-sectional view; etching the second conductive film and the first conductive film to form a first conductive pattern from the first conductive film and a plurality of second conductive patterns from the second conductive film, the second conductive patterns being located apart from each other on the first conductive pattern; and forming a plurality of channel forming regions, a plurality of first impurity regions, a plurality of second impurity regions and a plurality of third impurity regions in the semiconductor layer by doping an impurity element imparting one conductivity, wherein each of the first impurity regions is located outside the first conductive pattern, each of the second impurity regions is overlapped with the first conductive pattern, and each of the third impurity regions is located between two of the channel forming regions, and wherein the number of the second conductive patterns and the number of the channel forming regions are the same and the number is at least three.