Cathode ray tube having a deflection unit with a set of...

Details Cathode ray tube having a deflection unit with a set of... Cathode ray tube having a deflection unit with a set of...

H - Electricity

01

J

313/35.123

H01J 29/76 (2006.01) H01J 29/56 (2006.01)

Patent

CA 1181461

-20- ABSTRACT: The more and more stringent requirements regard- ing convergence (in colour display tube deflection unit com- binations) and spot quality (in monochrome display tubes deflection unit combinations) require cathode ray tubes with deflection units which when energized produce dynamic multi-pole fields which are strongly modulated. The condi- tion that static multipole fields, when an electron beam passes eccentrically, have a dynamic component is used in cathode ray tube-deflection unit combinations according to the invention to simulate, where required, a strong modula- tion of the dynamic multipole deflection fields. The addition of a negative static eightpole field in the centre of the deflection area may lead, for example, to a consider- ably improved spot quality in monochrome display tube deflection unit combinations.

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