Electric lamp and discharge devices – Cathode ray tube – Beam deflecting means
Patent
1991-06-06
1992-12-08
Yusko, Donald J.
Electric lamp and discharge devices
Cathode ray tube
Beam deflecting means
313402, 313440, 315 8, 315 85, 335213, 335284, 361267, H01J 2976
Patent
active
051700948
ABSTRACT:
A compensating coil for a scanning electron beam display such as a color television tube reduces undesirable deflection of the electron beams due to ambient magnetic fields, in particular the geomagnetic field. A first coil section has at least one winding disposed to encircle the tube neck, perpendicular to the Z axis. Upper and lower coil sections are disposed above and below the first coil section, each inclined forwardly along the Z axis and having a loop encompassing an area extending in the X and Y directions generally following the surface of an internal magnetic shield. The coil sections are coupled in series. The upper and lower coil sections have a wider X axis dimension proceeding forwardly along the Z axis, being keystone shaped. Lateral lengths of the upper and lower coils sections connect to the first coil section at lateral sides, such that the compensating coil is a continuous winding. The first coil section may have two passes for each pass of the upper and lower coil sections.
REFERENCES:
patent: 3582721 (1971-06-01), van Hoorn et al.
patent: 3614519 (1971-10-01), Figlewicz
patent: 3872347 (1975-03-01), Matsushima et al.
patent: 3879633 (1975-04-01), Stark, Jr.
patent: 4940920 (1990-07-01), Giannantonio et al.
Hitachi Color Picture Tube Technical Data No. 74D-5659, dated Mar. 3, 1988 revised Apr. 12, 1988, pp. 23 and 24.
Antonelli Goffredo
DePaolis Cesare
Giannantonio Giuseppe
Davenport Francis A.
Laks Joseph J.
Patel Ashok
Tripoli Joseph S.
Videocolor S.p.A.
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