Focus yoke, electromagnetically focused CRT display with the foc

Details Focus yoke, electromagnetically focused CRT display with the foc Focus yoke, electromagnetically focused CRT display with the foc

1992-12-15

1994-07-19

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315 8, 315389, 313442, G09G 104, H01J 2906, H01J 2946

Patent

active

053312562

ABSTRACT:
A focus yoke used for an electromagnetically focused CRT display comprises: a cylindrical permanent magnet unit which is disposed around a neck portion of a CRT and is spaced from the circumference of the neck portion; a core unit which defines a toroidal space together with the cylindrical magnet unit for substantially surrounding the neck portion, the core unit forming a magnetic path to guide magnetic lines of force generated by the cylindrical magnet unit; a dynamic focus winding unit disposed in the toroidal space; and a winding unit disposed externally of said toroidal space for eliminating an undesired magnetic field of an inverse polarity generated due to the cylindrical magnet unit.

REFERENCES:
patent: 3466499 (1969-09-01), Beth
patent: 4198592 (1980-04-01), Miyoshi et al.
patent: 4388619 (1983-06-01), Beck
patent: 4546291 (1985-10-01), Morioka et al.

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