Patent ID: 8823853

Claim:
A solid-state image sensor comprising: a charge accumulation region of a first conductivity type formed in a semiconductor region; an isolating semiconductor region formed in the semiconductor region and formed from an impurity semiconductor region of a second conductivity type; a channel stop region formed from an impurity semiconductor region of the second conductivity type which is located in the semiconductor region and formed on the isolating semiconductor region; and an insulator arranged on the channel stop region, wherein the insulator includes a first insulating portion arranged on the channel stop region, a second insulating portion extending laterally from the first insulating portion, wherein a thickness of the second insulating portion decreases with an increase in distance from the first insulating portion, and wherein a portion of the insulator, whose thickness gradually changes, consists of the second insulating portion, and a third insulating portion being formed on the first insulating portion so as to protrude from a structure consisting of the first insulating portion and the second insulating portion, the third insulating portion including (i) a flat upper face and (ii) a side face extending from the flat upper face of the third insulating portion to an upper face of the second insulating portion, the side face being formed as a part of an exposed surface of the insulator.