Electromagnetic deflection unit for a television picture display

Details Electromagnetic deflection unit for a television picture display Electromagnetic deflection unit for a television picture display

1987-01-21

1988-07-05

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

335213, H01J 2976, H04N 928

Patent

active

047557141

ABSTRACT:
An electromagnetic deflection unit for a television picture display tube, the deflection unit being arranged around the envelope of the display tube and comprising a first deflection coil and a second deflection coil located more closely to the display tube envelope than the first deflection coil and coaxially therewith. An annular core of magnetizable material encloses groups of conductors of both the first and second deflection coils. An additional annular core of magnetizable material encloses groups of conductors of only the second deflection coil, being placed around the portion of such coil which extends beyond the end of the first deflection coil in the direction toward the display screen of the display tube. The mutual locations of the dipole fields produced by the deflection coils thereby reduce north-south raster error.

REFERENCES:
patent: 3020434 (1962-02-01), Bloomsburgh
patent: 4260974 (1981-04-01), Nelle

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