Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1991-07-22
1992-06-02
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2958
Patent
active
051189992
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. A horizontal deflection driving circuit is coupled to a horizontal deflection coil and provides deflection current to the horizontal deflection coil for scanning the beam repetitively on the screen. The focusing coil is driven from a current step-down transformer having a primary winding coupled in series with the horizontal deflection coil. A secondary winding of the transformer is coupled to the focusing coil for driving the focusing coil with a horizontal rate parabolic current. A capacitor-resistor circuit is coupled in parallel with the focusing coil and with the secondary winding of the transformer for adjusting a phase relationship of the parabolic current relative to the horizontal deflection current and for adjusting the amplitude of the parabolic current.
REFERENCES:
patent: 4587465 (1986-05-01), Truskalo
patent: 4611151 (1986-09-01), Hoover et al.
patent: 4644230 (1987-02-01), Federle
patent: 5039923 (1991-08-01), Ogino et al.
Service Manual of a projection television rec., VP8X2 chassis, publ. by Hitachi Corp., pp. 58, 59, 68, 279 & 280.
Jackson David R.
Nero Leroy W.
Blum Theodore M.
Henig Sammy S.
Laks Joseph J.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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