Patent ID: 6492765
Filing Date: 2002-12-10
Classification: H01J

Abstract:
A cathode structure for a cathode-ray tube, comprising a base containing a reducing element and an electron-emissive material layer formed on the base,wherein the cathode structure satisfies a relationship of 0.24&lE;B/A&lE;0.93, where A denotes an area of a surface for layer formation of the base and B represents an area where the base and the electron-emissive material layer are in contact with each other, and has a zero-electric-field saturation current density of at least 6.4 A/cm2 after an implementation of an accelerated life test for 5000 hours under conditions of a vacuum of 10âˆ’7 mmHg, a cathode temperature of 820Â° C., and a current led out from a cathode of DC 300 &mgr;A.