U.S. Philips Corporation

Albertus A Sluijterman

Nicolaas G Vink

Joris A Nieuwendijk

Werner A Heijnemans

A combination of a monochrome cathode-ray tube with a deflection unit for applications which require high resolution. The deflection unit produces a magnetic field having a six-pole component which is positive on the screen side to minimize raster distortion and which, in the deflection center, has a strength and polarity sufficient to minimize spot distortion. Preferably the effective length 1 of the deflection field satisfies the conditon

Combination of a monochrome cathode-ray tube and a deflection unit

A device for displaying television pictures comprising a display tube in the neck of which a gun system is present for emitting at least one electron beam towards a display screen, and comprising an electromagnetic deflection unit which is provided around the envelope of the display tube and which comprises a first deflection coil and a second deflection situated coaxially with respect to the first deflection coil, each having two diametrically oppositely located coil units. Each coil unit of the first deflection coil consists of two sub-coil units which are arranged axially with respect to each other, the sub-coil units which are present on the side of the gun system having a winding distribution for together generating a dipole deflection field in combination with a positive sixpole deflection field, the sub-coil units which are present on the side of the display screen having a winding distribution for together generating a dipole field in combination with a negative sixpole field on their sides remote from the display screen and a positive sixpole field on their sides facing the display screen.

Device for displaying television pictures including a deflection unit

The stringent requirements regarding convergence (in color display tubes) and spot quality in monochrome display tubes are met by deflection units which produce dynamic multi-pole fields which are strongly modulated. Static multipole fields, which have a dynamic component when an electron beam passes therethrough, are used in cathode ray tube-deflection unit combinations to simulate, a strong modulation of the dynamic multipole deflection fields. In one combination, the production of a negative static eightpole field in the center of the deflection area improves spot quality.

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Eindhoven, Netherlands

Albertus A Sluijterman