X-ray apparatus comprising a photoconductor and a charging device
AssigneeU.S. Philips Corporation
InventorWaldemar Lumma
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Abstract
An apparatus, including a photoconductor (1) for converting X-rays into a charge pattern, and a controllable charging device (3, 9) for charging the surface of the photoconductor to a defined potential. The service life of the charging device is prolonged in that there is provided a measuring device for measuring the potential on the surface of the photoconductor and for controlling the charging device in dependence on the potential.
Claims7
An X-ray apparatus, comprising a photoconductor for converting X-rays into a charge pattern, a controllable charging device for charging the surface of the photoconductor to a defined potential by a corona discharge, and a measuring device for measuring the potential on the surface of the photoconductor and for controlling the charging device in dependence on the measured potential in a manner that the corona discharge is stopped when a predetermined potential state is reached on the surface of the photoconductor, wherein the measuring device comprises a measuring electrode and a reference electrode, a charge on the measuring electrode being determined successively by the potential on the surface of the photoconductor and by the potential of the reference electrode.
Dependencies are inferred from the claim text.