Deflection unit having a thin-walled yoke ring for cathode-ray t

Details Deflection unit having a thin-walled yoke ring for cathode-ray t Deflection unit having a thin-walled yoke ring for cathode-ray t

1986-07-25

1988-03-08

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

335210, 335297, H01J 2970, H01F 300

Patent

active

047301457

ABSTRACT:
A deflection unit (6) for a cathode-ray tube having a yoke ring (9) of a sintered, oxidic, ferromagnetic material. The yoke ring has a reduced wall thickness with respect to the wall thickness of conventional yoke rings, such reduced thickness being less than 6 mm and preferably in the range from 2 to 4 mm, and yet the ring is of sufficient mechanical rigidity because it is essentially stress-free. That may be achieved by sintering and cooling the yoke ring so that the oxygen content near the surface differs very little from that in the interior thereof, or so that a substantial difference in oxygen content is only present in a very thin surface layer thereof.

REFERENCES:
patent: 3512233 (1970-05-01), Mancini
patent: 4431979 (1984-02-01), Stijntjes et al.

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