Cathode-ray tube apparatus with magnetic spacers between magnetic rings
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United States of America Patent
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Jun 10, 2008
Grant Date -
Sep 15, 2005
app pub date -
Mar 1, 2005
filing date -
Mar 5, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A plurality of magnet rings for correcting a convergence are arranged in a tube axis direction with spacers interposed therebetween, on an outer circumferential surface of a neck. A velocity modulation coil for modulating a scanning velocity in a horizontal direction of an electron beam is placed so that a position of the velocity modulation coil in the tube axis direction is overlapped with those of the magnet rings. At least one of the spacers is made of only a magnetic substance. Alternatively, at least one of the spacers is made of a magnetic substance, and the outermost surface in a radius direction of the spacer made of a magnetic substance is covered with a non-metallic material. Because of this, the magnetic field formed by the velocity modulation coil can be intensified without disturbing the magnetic field of the magnet rings of a CPU.
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