Magnetic shield for visual display terminals

Details Magnetic shield for visual display terminals Magnetic shield for visual display terminals

1989-06-12

1991-02-12

Picard, Leo P.

Electricity: conductors and insulators

Anti-inductive structures

Conductor transposition

174 35MS, H05K 900

Patent

active

049926241

ABSTRACT:
A magnetic shield is designed to be retrofitted over a flyback transformer of a cathode ray tube display terminal. The magnetic shield consists of a layer of metal conductor, for example mu metal, and a layer of insulation, for example polyester film. The layer of insulation is placed upon the layer of metal conductor and the layers are rolled to form a spiral having greater than two windings. Tape may be used to secure the shape of the spiral. Additionally foam rubber pads may be attached to the inside of the spiral to provide a secure mechanical mounting to the flyback transformer and to provide air spacing as additional insulation against corona discharge. Also shrink tubing may be placed over the spiral to provide additional support to the spiral shape and to provide heat and electrical insulation.

REFERENCES:
patent: 4598165 (1986-07-01), Tsai
patent: 4647714 (1987-03-01), Goto
patent: 4896001 (1990-01-01), Pitts et al.

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