Patent ID: 7944489

Claim:
An electric-charge transfer device comprising: an electric-charge transfer unit that is transferred and driven with transfer pulses not less than three phases to transfer a signal charge; and a driving unit for supplying said transfer pulses not less than three phases to drive said electric-charge transfer unit, wherein said transfer pulses not less than three phases assume a first level and a second level, wherein said driving unit employs driving with multiple phases not less than three phases and drives said electric-charge transfer unit, such that said first level period exists at only one phase for each time and a corresponding first level voltage is output in a transfer direction sequence, and wherein with said electric-charge transfer unit, transfer gate electrodes to which said respective transfer pulses are applied are arrayed in parallel, and the transfer gate electrodes on the last stage are connected to supply wirings of the last transfer pulses that are different from said transfer pulses, wherein said driving unit sets the amplitudes of said transfer pulses not less than three phases to lower than the amplitudes of said last transfer pulses, and wherein said driving unit sets a duty ratio of said last transfer pulses to 50% and drives a last stage.