Electric lamp and discharge devices – Cathode ray tube – Beam deflecting means
Patent
1988-02-11
1990-05-01
Yusko, Donald J.
Electric lamp and discharge devices
Cathode ray tube
Beam deflecting means
313437, 313440, 335213, 335214, H01J 2970
Patent
active
049221671
ABSTRACT:
Picture display device having a display tube (3) and a deflection unit (9) comprising a field deflection coil and a line deflection coil (11). To comply with a predetermined interference radiation standard, the picture display device comprises a first set of (horizontal) interference suppression coils 18, 19 arranged symmetrically relative to the plane of symmetry of the line deflection coil and a second set of (vertical) interference suppression coils 18a, 19a arranged at right angles to the plane of symmetry of the line deflection coil, which coils are oriented in such manner and in operation are energizable in such manner that, measured at a predetermined distance from the picture display device, at least the strength of the local magnetic dipole field is below a desired standard. Each coil of the second set preferably comprises at least two sub-coils arranged parallel to each other at a given distance in order to reduce the energy content of the coil system.
REFERENCES:
patent: 2994803 (1961-08-01), Goldberg
patent: 4484166 (1984-11-01), Osinga et al.
patent: 4635934 (1987-01-01), Toshiyasu et al.
patent: 4709220 (1987-11-01), Sakane et al.
patent: 4758810 (1988-07-01), Tamura
Bosch Gerrit
Doomernik Fransiscus M. P. P.
Groothoff Adriaan J.
Sluyterman Albertus A. S.
Horabik Michael
Marion Michael E.
U.S. Philips Corporation
Yusko Donald J.
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