PURPOSE: To realize a photoelectric conversion of superior performance, by forming a circulation loop of two charge storage units for one light-receiving unit.
CONSTITUTION: An optical charge generated in photosensitive picture element units S1WSN is stored in a charge storage unit ST1. When SH1 is of high level, the charge stored in the storage unit ST1 is transmitted temporarily to a charge transmission unit GA, and when SH1 is inverted to be of low level, a charge Q is stored in a storage unit ST2. When the charges stored in the storage units ST1 and ST2 are transmitted temporarily to charge transmission units GA and GB and SH1 is inverted to be of low level, a charge Q of an information on a surrounding light is stored in the storage unit ST2, while a charge Q on an information at the time of projection of a light is inputted to ST1. These operations are repeated sequentially, and the optical informations obtained when the light is projected and those obtained when no light is projected are added up in circulation. Thereby true projection signals of all the photosensitive picture elements can be obtained, and thus a distance to a remote object can be detected with high accuracy.
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SATOU YUUICHI
KAWABATA TAKASHI
