X-ray generating device
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United States of America Patent
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Issued Date -
Jun 30, 2005
app pub date -
Jul 26, 2004
filing date -
Dec 25, 2003
priority date (Note) -
Abandoned
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Abstract
An X-ray generating device comprises a focal electrode (10) placed adjacent to the cathode (9) and provided with a focal aperture (10a) aligning with the cathode. A positive voltage is applied to the focal electrode relative to the cathode so that equipotential lines around the focal aperture may bulge toward the X-ray target (2). Thereby, the part of the electron beam having a large diverging angle is captured by the focal electrode, and only the part of the electron beam having a uniform diverging angle is allowed to pass through the focal aperture so that the electron beam can be favorably micro focused upon the X-ray target and can be given with a high intensity.
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