Rca Inc.

Appleton D Cope

Benjamin Abeles

Christopher R Wronski

Albert Rose

If drain structures bound the field register(s) of a CCD imager on the sides parallel to the direction of charge transfer therethrough, some portion of the charge carriers generated by photoemission will be lost to the drain structures from the charge transfer channels along those sides. If the charge transfer channels along those sides of the field register(s) do not have register boundary drain structures alongside them, on the other hand, charge carriers from the semiconductor substrate outside the field register(s) will migrate to them. These charge carriers may be thermally generated 'dark current', for example. In either case the side charge transfer channels do not have adjacent charge transfer channels that the other charge transfer channels in the field register(s) do, leading to undesired edge effects in the outputs of these side charge transfer channels. To eliminate the need for relatively complex blanking circuitry following the CCD output register, these outputs are not forwarded to the output register used for parallel-to-series conversion of image samples supplied from the field register(s).

Suppression of edge effects arising in CCD imager field registers

A photoconductive body of antimony trisulfide is coated on one surface with a layer of an insulating material having particles of a conductive metal dispersed throughout. When used as a target for a vidicon type camera tube, the metal particle-containing insulating layer lowers the dark current of the tube without affecting the photocurrent or spectral response.

Low dark current photoconductive device

1. A television camera tube comprising an elongated envelope, an electron gun in one end of said envelope for producing an electron beam, a target electrode in the other end of said envelope and in the path of said beam, said target electrode comprising a transparent conductive coating, a N-type photoconductor on said coating, a P-type photoconductor on said N-type photoconductor, another N-type photoconductor on said P-type photoconductor, a rectifying junction formed between each adjacent pair of said photoconductors and means for applying a reverse bias across at least one of said junctions.

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Hightstown, NJ, United States of America

Appleton D Cope