Edge-bonded bi-metallic strip extending from metal plate on shadow mask to stud via spring of substantially smaller cross-sectional area than strip

Claim 1

A color cathode ray tube having an enclosing envelope including a funnel portion and a faceplate panel having a pluralitY of phosphor dot triodes deposited thereon, including in combination, a shadow mask device, first, second and third studs respectively mounted at the top and on each side of said faceplate panel, means for suspending the mask device from the studs in a spaced relation to the front panel, said means including three substantially straight edge bonded bimetallic strips, connecting means connecting each strip to the top and each side of the mask device, said connecting means including a metal plate connected to said shadow mask, each said bimetallic strip being fastened at one end to said metal plate, a spring member connected to the unconnected end of each said strip, each said spring member having a portion adapted to be fastened to a respective stud, said edge bonded bimetallic strips being responsive to temperature changes in the tube to move the shadow mask relative to the front panel to reduce electron gun beam landing errors on the phosphor dot triodes, and each said spring member having a cross-sectional area substantially smaller than the cross-sectional area of each said edge bonded bimetallic strip thereby providing substantial thermal isolation of each said bimetallic strip from the respective studs thereby enhancing the response of said bimetallic strips to temperature changes to accurately position the shadow mask relative to the front panel.