Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1998-03-26
2000-06-20
Westin, Edward P.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
3153821, 315368323, 348806, G09G 104, H01J 2958
Patent
active
060781513
ABSTRACT:
In a dynamic focus circuit for a CRT, a first saw wave generating circuit generates a first saw wave signal in reponse to a horizontal synchronization signal, and a first amplifier amplifies the first saw wave signal with a first gain. Also, a first differential amplifier, amplifies the difference in voltage between the output signal of the first amplifier and a first reference voltage signal, and a first multiplier, calculates a square value of the output signal of the first differential amplifier to generate a horizontal parabolic signal. Similarly, a vertical parabolic signal is generated by a second saw wave circuit, a second amplifier, a second differential amplifier and a second multiplier. The horizontal parabolic signal and the vertical parabolic signal are added by an adder to generate a focus control signal.
REFERENCES:
patent: 3757161 (1973-09-01), Kline
patent: 4249112 (1981-02-01), McKibben
patent: 4490653 (1984-12-01), Olmstead
patent: 4536682 (1985-08-01), Pierick
patent: 4633144 (1986-12-01), McKibben
patent: 4677340 (1987-06-01), Miller et al.
patent: 4683405 (1987-07-01), Truskalo et al.
NEC Corporation
Wells Nikita
Westin Edward P.
LandOfFree
Simple dynamic focus circuit having saw wave generating circuits does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Simple dynamic focus circuit having saw wave generating circuits, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Simple dynamic focus circuit having saw wave generating circuits will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1855926