CCD imager having four-phase vertical shift registers operated by three-valued clock signals

Invention: CCD imager having four-phase vertical shift registers operated by three-valued clock signals

Year	Description
1994	Invention patented by Naoki Kato on February 14th, 1994. Abstract: A CCD imager includes at least one four-phase vertical shift register having first, second, third and fourth transfer electrodes. In order to prevent nonuniform distribution of smear charge and other unwanted charge, and improve the quality of a picture, there is further provided a means for making the potential well under each first electrode deeper than the potential wells under the second, third and fourth electrodes. Preferably, a N-type semiconductor region is formed under each first electrode by ion implantation.
Source: selected by the editor from original sources.