Cathode-ray tube having an ion trap

Details Cathode-ray tube having an ion trap Cathode-ray tube having an ion trap

1987-05-26

1988-05-10

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

313445, H01S 2974

Patent

active

047437944

ABSTRACT:
Positive ions which are generated in a vacuum tube (1) and can adversely affect the electron emission of a cathode (3) are collected for the major part by a screen grid or diaphragm (5), which forms part of a positive electron lens (4,5). In the case of a semiconductor cathode having a circular emission region (13) having a diameter larger than that of the opening in the screen grid (5), this emission region (13) is struck only by positive ions generated in a small region between the cathode (3) and a first grid (4). These ions moreover have a comparatively low energy so that the emission behavior is to only a limited extent adversely affected by sputtering by positive ions which would remove cathode material (33), such as cesium.

REFERENCES:
patent: 2913612 (1959-11-01), Swedlund
patent: 4259678 (1981-03-01), van Gorkom et al.
patent: 4303930 (1981-12-01), van Gorkom et al.
patent: 4486687 (1984-12-01), Epsztein
patent: 4506284 (1985-03-01), Shannon
patent: 4516146 (1985-05-01), Shannon et al.

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