Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1994-08-08
1996-02-06
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
348745, H01J 2958
Patent
active
054898269
ABSTRACT:
A projection television receiver has a cathode ray tube with an electron gun for emitting an electron beam incident on a screen, an electromagnetic deflection yoke and an electromagnetic focusing coil. The focusing coil is included in a resonant circuit. The resonant circuit is energized by switching operation of a switching transistor in the vicinity of a retrace interval. Variations of the focusing coil current in the vicinity of the retrace interval provide dynamic focus.
REFERENCES:
patent: 2431077 (1947-11-01), Poch
patent: 2718606 (1955-09-01), Zuerker
patent: 3622836 (1971-11-01), Nielsen
patent: 4245159 (1981-01-01), Beisswenger
patent: 4587465 (1986-05-01), Truskalo
patent: 4611151 (1986-09-01), Hoover et al.
patent: 4644230 (1987-02-01), Federle
patent: 4758762 (1988-07-01), Van Gorkum et al.
patent: 4912405 (1990-03-01), Richardson
patent: 4987350 (1991-01-01), Hartmann et al.
patent: 5039923 (1991-08-01), Ogino et al.
patent: 5113162 (1992-05-01), Umehara et al.
patent: 5118999 (1992-06-01), Jackson et al.
patent: 5146142 (1992-09-01), Van Tol
patent: 5381079 (1995-01-01), Perreaut et al.
Soviet Patent Abstracts, Section EI, Week 8219, 23 Jun. 1982, Derwent Publications Ltd., F6263 E/19, SU-849-541 with translation.
Soviet Patent Abstracts, Section EI, Week 8720, 27 May 1987, Derwent Publications Ltd., 87-141775/20, SU-1259-519-A with translation.
Hitachi Service Manual, VP8X2 Chassis, Dec. 1989/90, pp. 58, 59, 68, 279, 280.
U.S. Appln. Ser. No. 08/001,103 filed Jan. 6, 1993, in the name of Perreaut et al., entitled Low Power Consumption Dynamic Focusing Circuit.
Fernsler Ronald E.
Knight Peter R.
Blum Theodore M.
Henig Sammy S.
Laks Joseph J.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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