Photoelectric conversion apparatus and image reading apparatus with good crosstalk characteristics

An image reading apparatus having a plurality of photoelectric conversion apparatus arranged in a one-dimensional or two-dimensional array and scanning means, wherein each of said photoelectric conversion apparatus comprises:

• a semiconductor substrate of a first conduction type;
• a plurality of first semiconductor regions formed in a surface of said semiconductor substrate and having a conduction type opposite to that of said substrate;
• a second semiconductor region having the same conduction type as said first semiconductor regions and disposed between said plurality of first semiconductor regions thus formed;
• and
• a third semiconductor region disposed between said first and second semiconductor regions, having the first conduction type, and having an impurity concentration higher than that of said semiconductor substrate,
• wherein said first semiconductor regions are surrounded by said second semiconductor region and third semiconductor region, and
• wherein said first semiconductor region and said third semiconductor region are separated mutually, and at least one of (1) a light shielding member and (2) a thick insulating region is provided on said second semiconductor region and said third semiconductor region.

A photoelectric conversion apparatus, comprising:

• a semiconductor substrate of a first conduction type;
• a plurality of first semiconductor regions formed in a surface of said semiconductor substrate and having a conduction type opposite to that of said substrate;
• a second semiconductor region having the same conduction type as said first semiconductor regions and disposed between said plurality of first semiconductor regions thus formed;
• and
• a third semiconductor region disposed between said first and second semiconductor regions, having the first conduction type, and having an impurity concentration higher than that of said semiconductor substrate,
• wherein said first semiconductor regions are surrounded by said second semiconductor region and third semiconductor region, and
• circuits each of which comprises a photoelectric conversion element an anode or cathode of which is said first semiconductor region, a transistor for amplifying an output from said element, a first reset transistor for resetting an output line of said transistor, and a second reset transistor for resetting the anode or cathode of said element, wherein said circuits are arranged in an array.

An image reading apparatus having a photoelectric conversion apparatus and a light source for illuminating an original document, wherein said photoelectric conversion apparatus comprises:

• a semiconductor substrate of a first conduction type;
• a plurality of first semiconductor regions formed in a surface of said semiconductor substrate and having a conduction type opposite to that of said substrate;
• a second semiconductor region having the same conduction type as said first semiconductor regions and disposed between said plurality of first semiconductor regions thus formed;
• and
• a third semiconductor region disposed between said first and second semiconductor regions, having the first conduction type, and having an impurity concentration higher than that of said semiconductor substrate,
• wherein said first semiconductor regions are surrounded by said second semiconductor region and third semiconductor region, and
• wherein said first semiconductor region and said third semiconductor region are separated mutually, and at least one of (1) a light shielding member and (2) a thick insulating region is provided on said second semiconductor region and said third semiconductor region.