Electron gun for cathode ray tube with improved cathode structur

Details Electron gun for cathode ray tube with improved cathode structur Electron gun for cathode ray tube with improved cathode structur

1992-03-20

1994-05-17

O'Shea, Sandra L.

Electric lamp and discharge devices

With support and/or spacing structure for electrode and/or...

For indirectly heated cathode

313446, H01J 2904, H01J 2948

Patent

active

053131339

ABSTRACT:
An improved cathode structure in an electron gun for a cathode ray tube comprises a sleeve having a cylindrical shape, a heater disposed in the interior of the sleeve, a cap disposed at the upper portion of the sleeve, and an electron-emitting material layer coated on the outer top surface of the cap. A gap having a dimension that is 13.5% to 15.5% of the inner diameter of the sleeve, is defined between the sleeve and the heater, thereby improving an overshoot in emission of electrons at an initial operation state of heater.

REFERENCES:
patent: 4000435 (1976-12-01), Jariwala
patent: 4912362 (1990-03-01), Barthelemy et al.
patent: 5030879 (1991-07-01), Derks

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