Crt focus utilising magnetic means

Details Crt focus utilising magnetic means Crt focus utilising magnetic means

H - Electricity

01

J

313/35.13

H01J 29/64 (2006.01)

Patent

CA 1320531

04942-1 RDF ABSTRACT The focus of an electrostatically focused CRT may be improved by placing a split resilient ring around the neck of the CRT having radiating posts which receive ring magnets magnetised across their diameter. The ring may be translated along the neck of the CRT in the vicinity of the cathode and the magnets oriented to bunch the electron beam from the cathode and move it onto the axis of the focusing electrode. Bunching improves the electron density distribution within the spot. The magnet mounted on the ring may be turned to counteract the perturbations due to the excessive field penetration of the yoke in the low beam velocity region. A d.c. bias is added to the yoke current to compensate the resultant offset picture. After positioning of the ring, it may be glued in place.

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