Colour selection electrode with symetrical hexagonal...

Details Colour selection electrode with symetrical hexagonal... Colour selection electrode with symetrical hexagonal...

H - Electricity

01

J

313/35.16

H01J 29/06 (2006.01) H01J 29/07 (2006.01) H01J 29/81 (2006.01)

Patent

CA 1161094

PHN 9658 11 ABSTRACT; In a cathode-ray tube for displaying coloured pictures comprising in an evacuated envelope means to generate a number of electron beams, a display screen comprising a number of regions luminescing in different colours, and colour selection means comprising a large number of apertures which assign each electron beam to luminescent regions of one colour. In the colour selec- tion means a magnetic quadrupole field is generated to form a magnetic quadrupole electron lens in each aperture. The luminescent regions have the shape of substantially parallel strips the longitudinal direction of which is substantially parallel to the defocusing direction of the quadrupole lens. The apertures are elongate, substan- tially hexagonal and symmetrical relative to their longi- tudinal axes and are situated with their longitudinal axes in a number of parallel rows which extend substan- tially parallel to the strips and the apertures of two juxtaposed rows are shifted relative to each other. It is possible, in spite of the large transmission of the colour selection means, to obtain a display screen having very uniform phosphor strips.

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