Electric lamp and discharge devices – Cathode ray tube – Beam deflecting means
Patent
1995-11-07
1998-11-24
Patel, Ashok
Electric lamp and discharge devices
Cathode ray tube
Beam deflecting means
335296, C04B 3526, H01J 2970
Patent
active
058412255
ABSTRACT:
Deflection ring of sintered MgZn-ferrite material, cathode ray tube comprising such a ring and moulding made from this material.
The invention relates to a deflection ring of sintered MgZn-ferrite material. In accordance with the invention, this deflection ring is characterized in that the majority of the grains of the sintered material have a monodomain structure. By virtue thereof, a relatively small heat dissipation occurs in the ring when it is used in a cathode ray tube. The average grain size of the sintered MgZn-ferrite material is preferably 2.8 micrometers or less. MgZn-ferrite materials whose composition corresponds to the formula Mg.sub.1-z Zn.sub.z Fe.sub.2-y O.sub.4, wherein 0.1<z<0.4 and 0.01<y<0.3, have the additional advantage that they have a relatively high saturation magnetization and a relatively high electrical resistance. The invention also relates to a cathode ray tube comprising the abovementioned deflection ring and to a moulding made from the above-mentioned MgZn-ferrite material.
REFERENCES:
patent: 4372865 (1983-02-01), Yu et al.
patent: 4472369 (1984-09-01), Kambe et al.
patent: 4730145 (1988-03-01), Van Der Meer et al.
patent: 4863625 (1989-09-01), Roelofsma et al.
patent: 5057738 (1991-10-01), Boerekamp
patent: 5304891 (1994-04-01), Otsuka
De Wit Hendrik J.
Van Der Valk Pieter J.
Van Der Zaag Pieter J.
Bartlett Ernestine C.
Patel Ashok
Spain Norman N.
U.S. Philips Corporation
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