Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Electron or ion beam deflecting type
Patent
1987-03-17
1988-03-01
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Electron or ion beam deflecting type
335214, H01F 312
Patent
active
047289155
ABSTRACT:
A pair of magnetic member for collecting leakage magnetic flux of barrel-shaped vertical deflection magnetical flux to produce an auxiliary vertical deflection magnetic field of pin-cushion type around the neck of a cathode ray tube at the part of the electron gun, wherein each magnetic member has a vertical principal face part which is to face in parallel to a vertical principal face part of the other magnetic member with regard to a vertical axis of the CRT, and a pair of bar-shaped member, that is an upper horizontal bars and a lower horizontal bars connected to the upper edge part and the lower edge part of the principal plane part and extending toward the neck of the cathode ray tube; the provision of the above-mentioned magnetic members on a deflection yoke of a color cathode ray tube decreases convergence coma and coma distortion of beam spots, and is suitable for producing color picture image with good color convergence, in especially large face wide deflection type color cathode ray tube.
REFERENCES:
patent: 3772554 (1973-11-01), Hughes
patent: 4307363 (1981-12-01), McGlashan
patent: 4335366 (1982-06-01), Alig et al.
patent: 4433268 (1984-02-01), Arisato
patent: 4600858 (1986-07-01), Iwasaki et al.
patent: 4636684 (1987-01-01), Yokota et al.
Iwasaki Katsuyo
Konosu Osamu
Harris George
Matsushita Electronics Corporation
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