Deflection yoke with a core extension

Details Deflection yoke with a core extension Deflection yoke with a core extension

1993-04-01

1995-11-07

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

313430, 313431, 313442, 335212, 335298, H01J 2976

Patent

active

054650267

ABSTRACT:
A deflection yoke includes a first core portion and a core extension portion. The core extension portion is located in the rear of the yoke closer to the beam entrance region. To adjust the yoke for the particular cathode ray tube on which it is mounted, the position of the yoke is adjusted for obtaining acceptable image geometry. Then, the core extension is moved with respect to the first core portion in a direction perpendicular to the longitudinal axis of the tube to obtain convergence symmetry while the position of the first core portion remains the same. In this way, convergence symmetry adjustment is accomplished separately from image geometry adjustment.

REFERENCES:
patent: 2646522 (1953-07-01), Shaw et al.
patent: 2821671 (1958-01-01), Kratz et al.
patent: 3189775 (1965-06-01), Fyler
patent: 3247426 (1966-04-01), Havn
patent: 3711802 (1973-01-01), Torsch
patent: 3778669 (1973-12-01), Cooper et al.
patent: 4100518 (1978-07-01), Smith
patent: 4866336 (1989-09-01), Sluyterman
patent: 5306982 (1994-04-01), Maillot et al.

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