Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Patent
1994-10-21
1996-06-18
Picard, Leo P.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
335210, 313431, 313442, 315 535, 3153821, H01F 100, H01F 700, H01J 2970, H01J 2946
Patent
active
055282113
ABSTRACT:
A focusing device for a cathode ray tube comprises a plurality of substantially cylindrical permanent magnets, each having a longitudinal axis. A holder positions the magnets in an annular array at substantially equally spaced intervals in which the axes are substantially parallel to one another. Annular flanges of high magnetic permeability are disposed over longitudinally opposite ends of the magnets. First and second annular windings are symmetrically disposed substantially adjacent to and inwardly from the array of magnets. The magnetic mass of the focusing device can be varied by changing the number of magnets and/or the length of the magnets in the array. The magnets are magnetized in situ in the array by energizing a winding common to each of the magnets, after which the common winding is removed.
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Perreaut Jean M.
Roussel Bruno F.
Fried Harvey D.
Laks Joseph J.
Picard Leo P.
Ryan Stephen T.
Thomson Tubes and Displays, S.A.
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