Apparatus for forming electron beams

Details Apparatus for forming electron beams Apparatus for forming electron beams

1984-12-18

1987-10-06

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Ray generating or control

313574, 313581, 313618, 313632, 313339, H01J 116, H01J 1706, H01J 2904

Patent

active

046985468

ABSTRACT:
The present invention provides apparatus for forming electron beams, which may be advantageously employed in many applications, for example in display devices or thyratrons. A cathode member has a hole in its front surface. All the surfaces of the cathode member, except for the wall and base of the holes, are covered in an electrically insulating material such as glass. The cathode member and an anode member are contained within an envelope which also contains a gas filling. On application of a suitably high voltage between the cathode and anode members an electron beam is formed extensive in a direction away from the hole. The anode member may be located behind the front surface of the cathode member, and an electron beam still forms in front of the front surface.

REFERENCES:
patent: 3013171 (1961-12-01), Beck
patent: 3967150 (1976-06-01), Lien et al.
patent: 4123687 (1978-10-01), Poirier et al.
patent: 4196938 (1980-04-01), Lunev et al.
patent: 4527090 (1985-07-01), Menown et al.

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