Focusing device with permanent magnets for electron tube and ele

Details Focusing device with permanent magnets for electron tube and ele Focusing device with permanent magnets for electron tube and ele

1980-03-27

1982-06-29

Chatmon, Jr., Saxfield

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Combined cathode ray tube and circuit element structure

315 535, 315 393, 315 36, H01J 2534

Patent

active

043374131

ABSTRACT:
A focusing device for an electron tube is constituted by alternating magnets and pole pieces in the form of washers, which are fixed against one another in such a way as to form a cylinder surrounding the envelope of the tube and being of the same axis as the latter, the electron beam propagating along said axis. The magnetized washers have a central hole and are interrupted over part of their circumference by an opening permitting their fitting between the pole pieces previously fixed to the envelope.

REFERENCES:
patent: 2812470 (1957-11-01), Cook et al.
patent: 2947907 (1960-08-01), Bodmer
patent: 3448329 (1969-06-01), Meyerer et al.

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