RF emission shield for CRT displays

Details RF emission shield for CRT displays RF emission shield for CRT displays

1987-05-26

1988-08-30

Moore, David K.

Electric lamp and discharge devices: systems

With electromagnetic wave radiation preventing or shielding...

315 4, 315 8, 313479, H01J 152

Patent

active

047679697

ABSTRACT:
Certain applications require a CRT display to be well shielded against emitting RF electromagnetic energy. A shield placed at the neck portion of a CRT envelope inhibits RF emissions from being transmitted through the face portion of the CRT. The shield comprises longitudinal conductors for suppressing transverse magnetic (TM.sub.01, TM.sub.02 . . . ) mode emissions and circular conductors for suppressing transverse electric (TE.sub.01, TE.sub.02 . . . ) mode emissions. Placing the shield at the rear of the CRT envelope eliminates the need for covering the face portion of the CRT with an optically transparent screen. To eliminate RF emissions from the CRT display the housing is provided with a contiguous RF emission shield that is connected to the shield on the neck of the CRT. Alternatively, an internal RF emission shield would enclose the video circuitry which includes all potential sources of undesired RF emission. The internal RF emission shield would likewise be connected to the shield on the neck of the CRT.

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patent: 4695694 (1987-09-01), Hill et al.

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