Electrostatic shield for nearfield alternating electrical field

Details Electrostatic shield for nearfield alternating electrical field Electrostatic shield for nearfield alternating electrical field

1991-05-14

1993-07-20

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

With electromagnetic wave radiation preventing or shielding...

315 8, H01J 152

Patent

active

052296890

ABSTRACT:
An electrostatic shield and method for shielding an electric field are presented, having particular application to the reduction of electric field emissions from a CRT display. The electrostatic shield is formed from a flexible non-conductive substrate and includes a plurality of radially disposed conductive elements. The shield is secured to the outer surface of the CRT, between the deflection yoke and screen, and the conductive elements are coupled to ground potential. In addition to a method for using the abovedescribed shield, a method is presented for shielding the electric field by applying conductive traces directly to the surface of the CRT, again between the deflection yoke and screen. These traces are coupled to the aquadag coating on the outer surface of the CRT, effectively grounding the traces and providing the desired shielding effect.

REFERENCES:
patent: 3443138 (1969-05-01), Schwartz
patent: 3728573 (1973-04-01), Roeber
patent: 3867668 (1975-02-01), Shrader
patent: 4274031 (1981-06-01), Saito
patent: 4392083 (1983-07-01), Costello
patent: 4767969 (1988-08-01), Green
patent: 4864192 (1989-09-01), Buchwald
patent: 4940920 (1990-07-01), Giannantonio

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