Colour display tube

Details Colour display tube Colour display tube

H - Electricity

01

J

313/35.13

H01J 29/48 (2006.01) H01J 9/18 (2006.01) H01J 29/51 (2006.01)

Patent

CA 1187540

14 ABSTRACT: A colour display tube comprising in an evacuated envelope a display screen and an electron gun system which has first means to generate three electron beams situated in one plane and second means to focus the elec- tron beams on the display screen, which second means com- prise at least two focusing electrodes which are common for the three electron beams and which have apertures for each electron beam. The centres of the apertures for the central electron beam being situated on the axis of the central electron beam, the centres of the apertures for the two outermost electron beams being situated at various distances from the axis of the central electron beam. The apertures for the three electron beams comprise collars, starting with the side of the first focusing electrode remote from the first means, taken in the forward direc- tion of the electron beams. It is possible to provide a construction of such an electron gun system having aper- tures for the outermost electron beams in the focusing electrodes which are staggered relative to each other, with which it is possible in a simple manner to assemble such electron gun systems accurately. Therefore the common focusing electrodes are provided at least on one side with slot-shaped apertures at the area of the collars of the apertures for at least one of the outer- most electron beams. As a result of said slot-shaped apertures the electron gun system can be accurately assembled in a simple manner.

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