Device to shield mask cathode tubes from the earth's magnetic fi

Details Device to shield mask cathode tubes from the earth's magnetic fi Device to shield mask cathode tubes from the earth's magnetic fi

1987-11-06

1990-07-10

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Pulse storing

361150, H01J 2906, H01F 1300, H04N 929

Patent

active

049409204

ABSTRACT:
To improve the trichromatic cathode tube shielding effect given by the frame-mask set and by a shielding material made with material of low magnetic permeability, the external conductors of a de-magnetization coil with two loops are made to pass in front of the fastening lugs and not behind the frit plane as was the case before, and the position of the internal conductors is set to obtain the best compromise.

REFERENCES:
patent: 3340417 (1967-09-01), Panis et al.
patent: 3872347 (1975-03-01), Matsushima et al.
patent: 3879633 (1975-04-01), Stark, Jr.
patent: 3965386 (1976-06-01), Duistermaat et al.

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