Magnetic focusing system with improved symmetry and manufacturab

Details Magnetic focusing system with improved symmetry and manufacturab Magnetic focusing system with improved symmetry and manufacturab

1994-07-26

1996-04-09

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

313442, 335210, 335211, G09G 104, H01J 2946, H01F 700, H01F 312

Patent

active

055064825

ABSTRACT:
A magnetic focusing system has a pair of disc-shaped pole pieces between which several permanent rod magnets are mounted, their north poles in contact with one pole piece and their south poles in contact with the other pole piece. The permanent rod magnets are equally spaced around the outer perimeters of the pole pieces, and are separated from one another so that they do not create a ring. The pole pieces have central holes, between the rims of which a symmetric magnetic lens is formed for focusing an electron beam.

REFERENCES:
patent: 2822528 (1958-02-01), Janssen et al.
patent: 3681651 (1972-08-01), Schlesinger
patent: 4345183 (1982-08-01), Fukuda
patent: 4490644 (1984-12-01), Shimona
patent: 4668893 (1987-05-01), Amboss
patent: 5113162 (1992-05-01), Umehara et al.
Ohara, Hai-Bujon Gijutsu (High-Vision Technology), Ohm, 1992.
Terebijon Gazo Joho Kogaku Handobukku (Television Picture Information Engineering Handbook), Institute of Television Engineers of Japan, 1992.

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