Patent ID: 7030433

Claim:
A solid-state imaging device comprising: a plurality of N-type photodiode regions that are formed inside a P-type well of a Si substrate in order to photoelectrically convert incident light; a gate electrode having one edge positioned adjacent to each of the photodiode regions; a N-type drain region positioned adjacent to the other edge of the gate electrode; an element-isolating portion having a shallow trench isolation structure for isolating respectively a plurality of elements composed of groups of the respective photodiode regions and MOS transistors; and a gate oxide film having a thickness of not more than 10 nm, wherein the gate electrode has one edge portion overlapping the photodiode region; and a first region, a second region and a third region are formed on a surface portion extending from the upper portion of the photodiode region to the drain region in conditions such that the first region is disposed at a predetermined distance from one edge of the gate electrode and has a P-type first concentration C 1 , the second region is disposed with one edge positioned adjacent to the first region and the other edge overlapping the gate electrode in a certain region and has a P-type second concentration C 2 , and the third region is disposed with one edge positioned adjacent to the second region and the other edge positioned adjacent to the drain region and has a P-type third concentration C 3 , with the respective concentrations being in a relationship of C 1 >C 2 >C 3 or C 1 ≈C 2 >C 3 .