Deflection unit having a ring with field correction elements, an

Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Electron or ion beam deflecting type

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335210, 313431, 313433, 313442, H01H 100, H01F 700, H01J 2970, H01J 2974

Patent

active

055505228

ABSTRACT:
An electromagnetic deflection unit (5) comprising a coil holder (6) with a flange (8) whose inner side supports coils (10a, 10b) for (line) deflection of electron beams. At the flange side of the coil holder (magnetized) preformed elements (14) are arranged within these coils so as to influence the magnetic field of these coils (10a, 10b), thereby reducing spreading errors, caused during manufacture, throughout the display screen. For the purpose of automatic mounting of the preformed elements, an annular support having predetermined locations (in particular from 12 to 36) for accommodating preformed elements is used. The preformed elements (14) are accommodated at a plurality of these predetermined locations and, if made of a permanent magnetic material, produce magnetic fields having magnetic strengths measured at a distance of some mm above the heart of the elements in the range between 1 and 1000 .mu.T. In a special embodiment the elements of permanent magnetic material belong to a limited collection as regards their magnetic field strength.

REFERENCES:
patent: 3191104 (1965-06-01), Mak
patent: 4449109 (1984-05-01), Paddock
patent: 4535313 (1985-08-01), Van der Heijde
patent: 4782264 (1988-11-01), Yamazaki
patent: 4823046 (1989-04-01), Sluyterman
patent: 5117151 (1992-05-01), Sluyterman
patent: 5227753 (1993-07-01), Hirai

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