Solid-state image sensing device capable of reading two-line signal charges independently

A solid-state image sensing device, comprising:

• a photosensitive region having photosensitive pixels arranged two-dimensionally in row and column directions, for photoelectrically converting incident light into signal charges and accumulating the converted signal charges temporarily and respectively, and vertical transfer paths formed in the vicinity of the respective photosensitive pixels arranged in the column direction, for reading the signal charges and transferring the read signal charges in the column direction, respectively;
• a first accumulation region formed at respective first ends of the vertical transfer paths formed in the photosensitive region and having cyclic transfer paths each composed of loop-shaped linked transfer stages;
• a second accumulation region having transfer paths formed at respective second ends of the vertical transfer paths;
• a first horizontal transfer path formed on the side of the first accumulation region opposite from said photosensitive region, for transferring the signal charges in the row direction;
• a first charge detecting circuit disposed at an output terminal of said first horizontal transfer path, for detecting the signal charges transferred through said first horizontal transfer path;
• a second horizontal transfer path formed on the side of the second accumulation region opposite from said photosensitive region, for transferring the signal charges in the row direction;
• a second charge detecting circuit disposed at an output terminal of said second horizontal transfer path, for detecting the signal charges transferred through said second horizontal transfer path;
• and
• means for synthesizing the signal charges read from a first pixel group composed of the photosensitive pixels arranged in odd lines in said photosensitive region and the signal charges read from a second pixel group composed of the photosensitive pixels arranged in even lines in said photosensitive region wherein said synthesizing means is provided outside of said photosensitive region and is a third charge detecting circuit connected to said first and second charge detecting circuits, for adding outputs of said first and second charge detecting circuits, transferring the added signal charge output, and converting the added signal charge output into an electric signal.