Electric lamp and discharge devices – Cathode ray tube – Beam deflecting means
Patent
1981-07-06
1984-06-26
LaRoche, Eugene R.
Electric lamp and discharge devices
Cathode ray tube
Beam deflecting means
313425, 313427, 313428, 315368, 315387, H01J 2951, H01J 2954
Patent
active
044568533
ABSTRACT:
A cathode-ray tube including feedback means capable of producing a feedback signal indicative of the position, in at least two dimensions, of a scanning electron beam. The feedback means comprises a plurality of feedback elements disposed at selected locations within the tube enclosure. With a shadow-mask type CRT, the elements are formed on the gun-side surface of the shadow mask itself. With other kinds of CRT's, the elements are formed either on an interior supporting member or on the interior surface of the display medium. In one embodiment, the elements are formed of a phosphorescent material. In other embodiments, the elements are formed of materials capable of producing, upon excitation by a scanning electron beam, signals of visual or electrical character. The signals thus produced may be employed in a closed-loop correction system to accomplish automatic convergence and/or geometric adjustment of a displayed image.
REFERENCES:
patent: 3041391 (1962-06-01), Chatten
patent: 3731134 (1973-05-01), Iida
patent: 4099092 (1978-07-01), Bristow
patent: 4203051 (1980-05-01), Hallett et al.
patent: 4203054 (1980-05-01), Sowter
patent: 4335380 (1982-06-01), Wright
Axford, J., "Beam Position Feedback and Correlation in a Multibeam CRT", IBM Technical Disclosure Bulletin, vol. 24, No. 3, Aug. 1981, pp. 1516-1518.
Bates David J.
Denham Dan F.
Robinder Ronald C.
De Luca Vincent
LaRoche Eugene R.
Spence Thomas J.
Tektronix Inc.
Winkelman John D.
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