Cathode ray tube
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United States of America Patent
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-
Mar 30, 2004
Grant Date -
N/A
app pub date -
Jul 28, 1999
filing date -
Nov 24, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A cathode ray tube includes a panel on which a phosphor screen is formed, a cylindrical neck in which an electron gun assembly is arranged, and a funnel formed between the panel and the neck. The funnel has a substantially rectangular cone portion on which a deflection yoke is mounted. An anode button is provided on the funnel to supply a high voltage in the funnel, and an inner graphite layer is disposed on an inner surface of the funnel to form a path for the transmission of the high voltage. The inner graphite layer satisfies at least one of the following conditions on an inner surface of the cone portion: 0.9.ltoreq.Td/Th.ltoreq.1.36 0.9.ltoreq.Td/Tv.ltoreq.1.36 where Td is a thickness of the inner graphite layer disposed on inside corners of the cone portion, Th is a thickness of the inner graphite layer disposed on inside horizontal walls of the cone portion, and Tv is a thickness of the inner graphtie layer disposed on inside vertical walls of the cone portion.
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