Distortion correcting apparatus for X-ray image tube
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United States of America Patent
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app pub date -
Jul 9, 2007
filing date -
Nov 9, 2005
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Abandoned
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Abstract
A magnetic field intruding into an electron lens area from outside an X-ray image tube is detected by a magnetic field sensor. A magnetic field for offsetting the magnetic field is generated by a coil arranged in an input surface area of the X-ray image tube, so that the distortion is corrected by removing the effects of the magnetic field. The magnetic field sensor is arranged in an area surrounded by a magnetic shield of the X-ray image tube and constituting an outer peripheral area on the electron lens area side distant from the input surface area of the X-ray image tube. The magnetic field sensor is such that the effects of the magnetic field generated by the coil are reduced and the magnetic field intruding into the electron lens area is accurately detected.
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