Browse Prior Art Database

Using Metal Film to Drain Electrostatic Fields Produced by CRT's

IP.com Disclosure Number: IPCOM000037495D
Original Publication Date: 1989-Feb-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Kilmartin, MJ: AUTHOR

Abstract

Disclosed is a process used to block the elctrostatic fields that emanate from the front of Cathode Ray Tubes (CRT's). A metal film is applied to the front glass of the CRT and grounded through the metal mounting bracket that holds the CRT in place. The charge is drained on the side of the film touching the CRT, thus no field is emitted from the face of the CRT.

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Using Metal Film to Drain Electrostatic Fields Produced by CRT's

Disclosed is a process used to block the elctrostatic fields that emanate from the front of Cathode Ray Tubes (CRT's). A metal film is applied to the front glass of the CRT and grounded through the metal mounting bracket that holds the CRT in place. The charge is drained on the side of the film touching the CRT, thus no field is emitted from the face of the CRT.

Electrostatic fields of 25,000 volts or more can be measured a few inches in front of an unshielded CRT. Electrical charges take the path of least resistance to ground; therefore, charges emitted by the CRT are drained off immediately with the metal film applied to the CRT face.

The film is applied to flat glass surfaces using an adhesive to hold it in place. The edge of the film is extended to fit under the metal mounting frame for the tube. CRT faces that are rounded require preforming of the film before it is applied to prevent wrinkling.

Disclosed anonymously.

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