Indirectly heated cathode and cathode ray tube having same
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United States of America Patent
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Jun 3, 2008
Grant Date -
Jul 6, 2006
app pub date -
Mar 15, 2004
filing date -
Mar 14, 2003
priority date (Note) -
Expired
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Abstract
An indirectly heated cathode includes a cathode sleeve (2) housing a heater (1), a caplike base (3) attached onto the cathode sleeve (2), and an electron emitter layer (4) formed on a surface of the base (3). The cathode sleeve (2) is made of a metal material that contains nickel and chromium as main components and further contains at least silicon, aluminum, cerium, and lanthanum. According to this construction, the cathode sleeve (2) is kept from heat deformation. Hence a reliable indirectly heated cathode which suppresses variations in cutoff voltage can be realized.
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