Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1983-07-19
1986-10-28
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
342182, H01J 2978, G01S 714
Patent
active
046201378
ABSTRACT:
A sweep termination generating circuit adopts an octagon boundary for sweep termination which is set by combining a plurality of comparators so as to be circumscribed about the display screen of a circular CRT. When the sweep position is deviated from the center of the display screen for the purpose of displaying a radar image by PPI sweep, the circuit allows the comparators to detect that a scanning signal for scanning an electron beam from the off-center sweep position has reached the boundary for sweep termination and thereby generates a sweep termination signal.
REFERENCES:
patent: 2720645 (1955-10-01), Sherwin
patent: 2864969 (1958-12-01), Shulman
patent: 4059785 (1977-11-01), Clark, Jr.
patent: 4307396 (1981-12-01), Slater
Kato Yoshio
Numaho Yoshio
Ogawa Tetsuro
Okada Hiroshi
Barron Jr. Gilberto
Blum Theodore M.
Tokyo Keiki Company Ltd.
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