Electric lamp and discharge devices – Cathode ray tube – Ray generating or control
Patent
1985-11-01
1987-07-21
DeMeo, Palmer C.
Electric lamp and discharge devices
Cathode ray tube
Ray generating or control
313446, 357 13, H01J 2904
Patent
active
046820744
ABSTRACT:
A device for recording or displaying images or for electron lithographic or electron microscopic uses, comprising in an evacuated envelope (1) a target (7) on which at least one electron beam (6) is focussed. This beam is generated by means of a semiconductor device (10) which comprises an electrically insulating layer (42) having an aperture (38) through which the beam passes. The layer carries at least four beam-forming electrodes (43 through 50) which are situated at regular intervals around the aperture (38). Each of the electrodes has such a potential that an n-pole field or a combination of n-pole fields is generated, where n is an even integer from 4 through 16. A suitable choice of the n-pole field will make it possible to impart substantially any desired shape to the beam (6) and thus the focus on the target.
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patent: 4147953 (1979-04-01), Esteron
patent: 4259678 (1981-03-01), van Gorkom et al.
patent: 4303930 (1981-12-01), van Gorkom et al.
patent: 4370797 (1983-02-01), van Gorkom et al.
patent: 4574216 (1986-03-01), Hoeberechts et al.
Hoeberechts Arthur M. E.
Van Gorkom Gerardus G. P.
DeMeo Palmer C.
Kraus Robert J.
U.S. Philips Corporation
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