Cathode-ray tube having alternating electric field reduction dev

Details Cathode-ray tube having alternating electric field reduction dev Cathode-ray tube having alternating electric field reduction dev

1992-04-17

1994-10-18

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Envelope

313313, H01J 2906, H01J 2986

Patent

active

053571665

ABSTRACT:
In a cathode-ray tube, in order to readily and inexpensively reduce an alternating electric field irradiated by a deflection yoke to a front of the cathode-ray tube through a funnel part and a face panel, a conductive film for forming an electric field shield is formed from a neck part to a cone part of a glass bulb and is electrically connected to another conductive film formed on a funnel body part. The deflection yoke is mounted on the conductive film via an insulation sheet interposed therebetween. The conductive film is grounded to form an equipotential surface of 0 V in front of the deflection yoke. A transparent conductive film can be also formed on the external surface of the face panel to raise the reduction of the alternating electric field.

REFERENCES:
patent: 4217521 (1980-08-01), Dietch et al.
patent: 4392083 (1983-07-01), Costello
patent: 4564786 (1986-01-01), Baum et al.
patent: 4786973 (1988-11-01), Lock et al.
patent: 4988915 (1991-01-01), Zegers
patent: 5025490 (1991-06-01), Tamura

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