Patent ID: 7732843

Claim:
A solid-state image sensor comprising: an N-type semiconductor substrate; a P-type well formed in the N-type semiconductor substrate; an N-type horizontal transfer region formed in the P-type well; a gate insulating film formed on a surface of the N-type semiconductor substrate; a first storage gate electrode formed on a horizontal transfer outlet of the N-type horizontal transfer region via the gate insulating film; a first offset gate electrode formed on the horizontal transfer outlet via the gate insulating film which is next to the first storage gate electrode; a first P-type region in the N-type horizontal transfer region under the first offset gate electrode; and a first N-type region formed in the horizontal transfer region directly under the first offset gate electrode and the first storage gate electrode, wherein a concentration of an N-type impurity of the first N-type region is lower than a concentration of an N-type impurity of the N-type horizontal transfer region, wherein a bottom of the first N-type region is lower than a bottom of the N-type horizontal transfer region.