Patent ID: 7193257

Claim:
A solid state image sensing device in which a plurality of unit pixels containing a transistor for outputting a light signal having a ring shaped gate electrode and a photo diode is regularly arranged on a first conductive type substrate, each of the plurality of unit pixels comprising: a second conductive type well area provided over a surface of the first conductive type substrate; a first conductive type photoelectric conversion area of the photo diode provided in the second conductive type well area; the ring shaped gate electrode provided in an area other than the first conductive type photoelectric conversion area on the second conductive type well area with sandwiching a gate insulative film; a transfer gate electrode provided in an area disposed between the ring shaped gate electrode and the first conductive type photoelectric conversion area, and formed on the gate insulative film above the second conductive type well area with sandwiching the gate insulative film; a second conductive type drain area in high concentration provided at least in a part of an area on the surface of the second conductive type well area, wherein the area excludes regions for the ring shaped gate electrode and the transfer gate electrode, and electrically combined with the second conductive type well area; a second conductive type source area provided in an area confronting with a center opening of the ring shaped gate electrode on the second conductive type well area; and a first conductive type source neighborhood area provided in the second conductive type well area so as to surround the second conductive type source area and not so as to reach to the second conductive type drain area.