EP 1067572 A2 20010110 - Cathode ray tube with indirectly heated cathode
Title (en)
Cathode ray tube with indirectly heated cathode
Title (de)
Kathodenstrahlröhre mit indirekt geheizter Kathode
Title (fr)
Tuba à rayons cathodiques avec cathode à chauffage indirect
Publication
Application
Priority
JP 19015499 A 19990705
Abstract (en)
A cathode ray tube has a vacuum envelope formed of a panel portion (11), a neck portion (12) and a funnel portion (13) for connecting the panel portion and the neck portion, a phosphor screen (14) formed on an inner surface of the panel portion, and an electron gun (19) housed in the neck portion and including a cathode (40) and a heater (31a). The cathode includes a disk-shaped cathode base metal (41) having an oxide coating (42) thereon and a cylindrical cathode sleeve (43) housing the heater. The cylindrical cathode sleeve includes a small-diameter portion (43c) having the disk-shaped cathode base metal fitted within an end thereof and housing a top portion of the heater and a large-diameter portion housing leg portions (31) of the heater, and an axial length SL (mm) of the small-diameter portion and an outside diameter DD (mm) of the disk-shaped cathode base metal satisfies the following inequation: <DF>0.5 ≤ SL/DD ≤ 4.0. </DF> <IMAGE>
IPC 1-7
IPC 8 full level
H01J 1/18 (2006.01); H01J 1/26 (2006.01); H01J 29/04 (2006.01)
CPC (source: EP)
H01J 1/26 (2013.01); H01J 29/04 (2013.01)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 1067572 A2 20010110; EP 1067572 A3 20020821; CN 1279500 A 20010110; JP 2001023504 A 20010126; KR 100339749 B1 20020605; KR 20010015149 A 20010226; TW 452818 B 20010901
DOCDB simple family (application)
EP 00114001 A 20000704; CN 00106386 A 20000705; JP 19015499 A 19990705; KR 20000037875 A 20000704; TW 89113038 A 20000630