CRT focusing circuit with individually controlled switches devel

Details CRT focusing circuit with individually controlled switches devel CRT focusing circuit with individually controlled switches devel

1995-12-08

1998-05-05

Pascal, Robert

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

348806, H01J 2958

Patent

active

057479496

ABSTRACT:
A control means individually turns each switching means on or off so that a current has a waveform which is approximate to a parabolic waveform and is appropriate for focusing current flows in a focusing coil, synchronizing with a horizontal sweep. When the focusing current increases, energy is transferred from the power source to the focusing coil. When the focusing current decreases, energy is returned from the focusing coil to the power source by a flywheel current. Thus, the focusing current is supplied with less consumption.

REFERENCES:
patent: 3622836 (1971-11-01), Nielsen
patent: 3911295 (1975-10-01), Barkow
patent: 4499457 (1985-02-01), Hintze
patent: 5331256 (1994-07-01), Ogino et al.
patent: 5332953 (1994-07-01), Hartman et al.
patent: 5512804 (1996-04-01), Yamamoto

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