Electron gun for a cathode-ray tube for image display having an

Details Electron gun for a cathode-ray tube for image display having an Electron gun for a cathode-ray tube for image display having an

1998-02-11

2000-09-26

Patel, Nimeshkumar D.

Electric lamp and discharge devices

Electrode and shield structures

Cathodes containing and/or coated with electron emissive...

313346DC, 313447, H01J 114

Patent

active

061246670

ABSTRACT:
A cathode-ray tube is provided with an electron gun having a cathode and a control electrode and some other electrodes. The cathode includes an electron emissive material layer for emission of electrons through a hole in the control electrode. The hole in the control electrode has a diameter substantially in a rage of from 0.3 mm to 0.4 mm. The electron emissive material layer has a first layer made of an oxide of an alkaline earth metal formed on a support and containing no oxide of a rare earth metal, and a second layer made of an oxide of an alkaline earth metal formed on the first layer and containing an oxide of a rare earth metal substantially in an amount of from 0.8 wt % to 5.0 wt %.

REFERENCES:
patent: 4682077 (1987-07-01), Maruyama et al.
patent: 5216320 (1993-06-01), Koizumi et al.
patent: 5808404 (1998-09-01), Koizumi et al.
K. Sano et al., "High Current Density Cathodes for CRT Use", CRT, vol. 44, No. 6, pp. 736-742 (1990).
K. Sano et al., "High Current Density Cathodes for CRT Use", CRT, vol. 44, No. 6, pp. 736-742 (1990)(English translation thereof, (25 pages)).

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