H - Electricity – 01 – J
Patent
H - Electricity
01
J
313/35.11, 313/3
H01J 29/96 (2006.01) H01J 29/00 (2006.01)
Patent
CA 1281362
ABSTRACT OF THE DISCLOSURE A cathode ray tube (CRT) has a deflecting coil sur- rounded by a funnel-like casing of maygnetic material. The deflecting coil generates a magnetic deflecting field for the electron beam and a magnetic leakage field in the CRT environ- ment. The leakage field is composed of a dipole field and a quadrupole field. To reduce the magnetic field strength in the CRT environment a magnetic compensation field which is counter-directed to the leakage field is generated. The com- pensation field is composed of a dipole field which is gener- ated by a first compensation loop and a quadrupole field which is generated by a second compensation loop. The first compen- sation loop is substantially flat and at right angles to the magnetic deflecting field. The second compensation loop is flat and at right angles to the longitudinal symmetrical axis of the CRT and has an upper and a lower part which generate two mutually opposing dipole fields. The centres of gravlty of the compensation loops lie on the symmetrical axis respec- tively at the forward edge of the funnel-like casing and the forward part of the deflecting coil. The compensation loops are connected in series with the deflecting coil.
533084
Johansson Roland Thomas Wilhelm
Langh Stig Arne
Madsen Knud
Icl Systems Aktiebolag
Marks & Clerk
LandOfFree
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