Shielded cathode ray tube

Details Shielded cathode ray tube Shielded cathode ray tube

1991-04-23

1993-01-19

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

With electromagnetic wave radiation preventing or shielding...

315 8, 313402, 313479, H01J 152

Patent

active

051809478

ABSTRACT:
A shielded CRT (18) display includes a secondary shielding enclosure (14) for enclosing the CRT (18) and for inhibiting electromagnetic emissions therefrom. A primary shielded enclosure (12) internal to the secondary shielding enclosure (14) has a portion coaxial (16) with the neck portion (22) of the CRT (18) for also inhibiting electromagnetic emissions from the CRT (18). The CRT (18) includes an internal conductive layer comprised of an internal aquadag, wire mask, and phosphor coating. This internal conductive layer is grounded via a reactive path to ground to suppress electromagnetic emissions. This double shielding suppression technique eliminates the need for external shielding of the face portion of the CRT (18).

REFERENCES:
patent: 3867668 (1975-02-01), Shrader
patent: 4467241 (1984-08-01), Hines
patent: 4517487 (1985-05-01), Tamburrino
patent: 4556821 (1985-12-01), Cooper
patent: 4767969 (1988-08-01), Green
Service Manual for Sony Trinitron.RTM. Graphic Display Monitor GDM-1950/1952.

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