Electric lamp and discharge devices – Photosensitive – Secondary emitter type
Patent
1986-09-26
1990-03-13
Wieder, Kenneth
Electric lamp and discharge devices
Photosensitive
Secondary emitter type
313422, 313106, H01J 2906, H01J 4328
Patent
active
049085450
ABSTRACT:
In order to reduce contrast degradation in an electrostatically scanned flat cathode ray tube having a channel plate electron multiplier due to back-scattered electrons entering channels remote from their origin, steps are taken to restrict the acceptance angle of the channel plate electron multiplier. In one arrangement means are provided on the input surface to restrict the angle of entry to a range normally associated with the addressing electron beam. In another arrangement the ready emission of secondary electrons is restricted to a predetermined arcuate portion of the input of each channel of the electron multiplier. In either arrangement stray electrons are unable to impinge upon the secondary emitting material in the channels and in consequence produce many fewer back-scattered electrons. Optionally a material having a low back-scatter coefficient and a microscopically rough surface texture may be applied to the exposed surfaces, apart from the apertures, of the input side of the electron multiplier to reduce the number of back-scattered electrons.
REFERENCES:
patent: 3148304 (1964-09-01), Vieth et al.
patent: 3171056 (1965-02-01), Gabor
patent: 3395303 (1968-07-01), Kajiyama
patent: 3914634 (1975-10-01), Overall et al.
patent: 3974411 (1976-08-01), Faulkner et al.
patent: 4099079 (1978-07-01), Knapp
patent: 4422005 (1983-12-01), Washington et al.
patent: 4482836 (1984-11-01), Washington et al.
patent: 4511822 (1985-04-01), Washington et al.
Gill Ronald W. A.
Knapp Alan G.
Lamport Daphne L.
Washington Derek
Woodhead Alfred W.
Kraus Robert J.
U.S. Philips Corporation
Wieder Kenneth
LandOfFree
Cathode ray tube does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Cathode ray tube, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cathode ray tube will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-52467