Patent ID: 6441546
Filing Date: 2002-08-27
Classification: H01J

Abstract:
A shadow mask assembly comprising:(a) a pair of bars arranged in substantially parallel at a specific distance; the pair of bars being made of metal having a first thermal expansion coefficient; (b) a pair of arms fixed to the pair of bars in such a way that each of the pair of arms links the pair of arms together; the pair of arms applying a force that moves the pair of bars away from each other; the pair of arms being made of metal having a second thermal expansion coefficient; the pair of arms constituting a frame having an approximately rectangular opening along with the pair of bars; and (c) a shadow mask fixed to the pair of bars so as to cover said opening of said frame; said shadow mask being applied with a tensile force in a direction approximately perpendicular to the pair of bars due to said force of the pair of arms that moves the pair of bars away from each other, thereby keeping said mask in its specific shape; said shadow mask being made of metal having a third thermal expansion coefficient that is low enough for suppressing the doming phenomenon; said third thermal expansion coefficient of said mask being less than said second thermal expansion coefficient of the pair of arms.