Focus magnet for a projection type cathode-ray tube

Details Focus magnet for a projection type cathode-ray tube Focus magnet for a projection type cathode-ray tube

1991-12-23

1993-07-13

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Electron or ion beam deflecting type

H01F 700

Patent

active

052277526

ABSTRACT:
The present invention relates to a focus magnet for a projection type cathode-ray tube where a non-magnetic heat insulating member is disposed between a magnet having a penetrating hole formed therein and a coil wound within the magnet, whereby it can minimize a variation of focusing characteristics of an electron beam due to the heat generated in operation of the projection type cathode-ray tube, and improve a degree of roundness of a coil wound within the magnet.

REFERENCES:
patent: 3098943 (1963-07-01), Reiches

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