Shadow mask support means for a color television image tube

Claim 1

A shadow mask support mechanism for a color television picture tube including a plurality of mask supporters for supporting a shadow mask spread out on a frame opposite a face panel, at least one of said mask supporters comprising a bimetallic element having metal layers of different thermal coefficients of expansion for the deformation of said bimetallic element upon its heating for the purpose of displacing said shadow mask in the direction of the television screen, said bimetallic element being positioned in the direction of the length of said tube and secured at its one end to said shadow mask frame and at the other free end to one end of a leaf spring, the other end of said leaf spring extending in the direction of and engaging a pin secured on the side wall of said face panel, wherein said bimetallic element is disposed such that its free end on the side thereof closer to said pin thermally deforms less than on the side thereof disposed away from said pin, said bimetallic element being welded to said frame along a line intersecting a line along which said bimetallic element is welded to said spring, the angle of intersection of said welding lines being between approximately 5* and 40* .