Patent ID: 7138671

Claim:
A solid-state image sensor comprising: photoelectric conversion units operable to photoelectrically convert incident light into signal charge, and to store the signal charge, said photoelectric conversion units being arranged two-dimensionally on a semiconductor substrate; a charge transfer unit operable to transfer the signal charge read from said photoelectric conversion unit; and a charge read-out unit operable to read out the signal charge stored in said photoelectric conversion unit to said charge transfer unit, said charge read-out unit being formed between said photoelectric conversion unit and said charge transfer unit; wherein each of said photoelectric conversion units includes first conductive-type impurity regions formed on a surface of said semiconductor substrate and having boundaries on the side of said charge read-out unit, and a second conductive-type impurity region formed under the first conductive-type impurity regions, wherein a boundary of the second conductive-type impurity region on a side of said charge read-out unit is not on a same plane with any of the boundaries of the first conductive-type impurity regions on the side of said charge read-out unit, and wherein one of the first conductive-type impurity regions is formed over a region from a portion of a surface of said photoelectric conversion unit through a surface of said charge read-out unit until reaching said charge transfer unit.