Cathode-ray tube apparatus
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United States of America Patent
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Apr 8, 2008
Grant Date -
Aug 11, 2005
app pub date -
Feb 4, 2005
filing date -
Feb 10, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a cross-section including a tube axis, assuming that T1 represents a thickness of a funnel at a point on an outer circumferential surface of the funnel, which is placed at the same position in a tube axis direction as that of an end of a horizontal deflection coil on a phosphor screen side, and T2 represents a thickness of the funnel at a point on the outer circumferential surface of the funnel, which is placed at the same position in the tube axis direction as a position 7 mm away from the end of the horizontal deflection coil on the phosphor screen side to the phosphor screen side along the tube axis, the funnel includes at least one cross-section including the tube axis satisfying a relationship: T2/T1.gtoreq.1.18. Owing to this, cone halation can be prevented while an X-ray leakage amount is limited to a predetermined value or less.
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