GB1304567A - - Google Patents

Abstract

1304567 Colour television tubes PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 3 Sept 1970 [6 Sept 1969] 42247/70 Heading H1D In a colour television tube wherein a shadow mask is supported in a faceplate by means of resilient members attached to the mask and provided with an aperture or a stud adapted to engage a stud or an aperture on the faceplate, the stud being circular and the aperture a rounded triangle, deformation and consequent rigidity may be caused by the shrinking of the aperture over the stud on cooling from the high temperature employed in processing the tube; this effect is avoided by employing for the member in which the aperture is formed a material having a thermal expansion coefficient equal to or lower than that of the material used for the stud. In one arrangement (Fig. 4, not shown) each resilient member is a bimetal strip and the aperture is provided in the strip of lower thermal expansion coefficient. In other arrangements each resilient member is of chromium-nickel-steel and the aperture is formed in a plate of-material of low expansion coefficient which is either welded to one end of the member (Fig. 10, not shown) or extends across a large aperture in the member (Fig. 9, not shown). In further arrangements the resilient member is either connected to or integral with the stud; the co-operating aperture may be formed in a U-shaped strip secured to the glass wall (Fig. 5, not shown) or in the glass wall itself (Fig. 6, not shown) and in the latter case the aperture may be lined with metal (Fig. 7, not shown).