Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1994-10-26
1996-07-09
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315387, G09G 104
Patent
active
055347576
ABSTRACT:
An amplifying circuit for dynamic focus of the invention applies, in a DC feedback loop of amplifying circuit for horizontal dynamic focus, a parabolic waveform signal for correction of vertical dynamic focus to a non-inverting input terminal or inverting input terminal of a detection amplifier for DC feedback, or to an input terminal of a DC control circuit, and superposes on a parabolic waveform signal for correction of horizontal dynamic focus in an amplifying circuit for horizontal dynamic focus through the DC control circuit, thereby stabilizing the DC action point in the amplifying circuit for horizontal dynamic focus, and also obtaining the parabolic waveform signal for correction of horizontal dynamic focus superposing the parabolic waveform signal for correction of vertical dynamic focus from the output terminal of the amplifying circuit for horizontal dynamic focus. Therefore, the amplifying circuit for vertical dynamic focus required in the prior art is not necessary, and hence the circuit may be simplified.
Moreover, it is free from distortion of waveform, as experienced in the prior art, when adding after individually amplifying the parabolic waveform signal for correction of horizontal dynamic focus and parabolic waveform signal for correction of vertical dynamic focus, and therefore the distortion can be kept low as compared with the prior art.
REFERENCES:
patent: 4555649 (1985-11-01), Sharma
patent: 5146142 (1992-09-01), Van Tol
patent: 5331256 (1994-07-01), Ogino et al.
IBM Technical Disclosure Bulletin, "Dynamic Dynamic Focusing Circuit for High Resolution Display Monitor", vol. 31, No. 2, Jul. 1988.
European Search Report dated Jan. 27, 1995.
Issing Gregory C.
Matsushita Electric - Industrial Co., Ltd.
LandOfFree
Amplifying circuit for dynamic focus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Amplifying circuit for dynamic focus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Amplifying circuit for dynamic focus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1869217