Two-dimensional transfer in charge transfer device

A charge transfer device comprising a charge storage medium the bulk of which is of a first conductivity type, a first insulating layer covering at least a portion of one surface of said medium, a first conductive pattern comprising a series of elongated electrodes disposed parallel to each other extending in a first direction upon said first insulating layer, means under each of said electrodes for preventing the transfer of mobile charge in the medium in said first direction under said electrodes, a second insulating layer overlying said first conductive pattern, a second conductive pattern comprising a series of elongated electrodes disposed over said second insulating layer parallel to each other extending in a second direction which is noncollinear with said first direction, each of said electrodes overlying the first conductive pattern at certain areas and overlying said storage medium in the area between said first conductive pattern, the electrodes of said second conductive pattern defining transfer paths for movement of mobile charge carriers in the medium in said first direction in the spaces between the electrodes of the first conductive pattern extending substantially the length of the electrodes of the first conductive pattern and the electrodes of the first conductive pattern defining transfer paths in the medium in said second direction extending substantially the length of the electrodes of said second conductive pattern, and means for sequentially biasing a series of electrodes of one of said conductive patterns to transfer charge carriers in one of said noncollinear directions while biasing the other conductive pattern so as to form blocking potentials to movement of charge carriers in the other of said noncollinear directions.