Magnetic focusing device for cathode ray tubes
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United States of America Patent
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Mar 14, 1995
Grant Date -
N/A
app pub date -
Nov 9, 1992
filing date -
Nov 5, 1991
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Abstract
A magnetic focusing device is disposed around the neck of a cathode ray tube. The device comprises a magnetic frame formed by constituent pieces having different magnetic permeabilities and having a gap in a portion thereof radially closest to the neck. A static focusing coil is enclosed in the frame and energized by a direct current. A dynamic focusing coil is energized by a periodically variable current and disposed between the static coil and the neck of the tube. The dynamic focusing coil is disposed near the gap and uses as a magnetic circuit the portion of the frame consisting of the material whose imaginary component of magnetic permeability is the lowest.
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