Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1993-01-06
1995-01-10
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2958
Patent
active
053810791
ABSTRACT:
A focus coil for a television is disposed between scanning electron beam generator and a planar screen and has a winding coupled between a power supply and a current sink for providing a magnetic focusing field due to current in the coil. A focusing circuit comprises a resonant circuit coupled to the focus coil for generating a parabolic current in the focus coil to account for variations in the distance between the focusing device and the screen during scanning. The resonant circuit stores a portion of the energy developed during trace intervals and returns this energy to the power supply during retrace intervals. The resonant circuit includes a capacitor and an additional coil, in series with one another, and together in parallel with the focus coil. The additional coil is magnetically coupled to the focus coil and induces a reverse current in the focus coil during the retrace interval for returning energy to the power supply.
REFERENCES:
patent: 4758762 (1988-07-01), Van Gorkum et al.
patent: 4987350 (1991-01-01), Hartmann et al.
patent: 5043637 (1991-08-01), Gries et al.
patent: 5118998 (1992-06-01), Jackson et al.
patent: 5146142 (1992-09-01), Van Tol
Soviet Patents Abstracts, Section EI, Week 8219, 32 Jun. 1982 Derwent Publications, Ltd., F6263 E/19, SU-849-541.
Soviet Patents Abstracts, Section EI, Week 8720, 27 May 1987 Derwent Publications, Ltd., 87-141775/20, SU 1259-519-A.
IBM Technical Disclosure Bulletin, Dynamic Dynamic Focusing Circuit for High Resolution Display Monitor, vol. 31, No. 2, 1 Jul. 1988.
Perreaut Jean M.
Roussel Bruno F.
Blum Theodore M.
Fried Harvey D.
Laks Joseph J.
Thomson Tubes and Displays, S.A.
Tripoli Joseph S.
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