Abstract: A color CRT has a shadow mask formed from a bilayer composite of steel and invar. The thicknesses of steel and invar are chosen to take advantage of the lower thermal expansion coefficient of invar and the room temperature formability and higher modulus of elasticity of steel. Such composite masks exhibit reduced doming when compared to steel masks, and can be formed at room temperature.

Abstract: An apertured shadow mask directs electron beams toward phosphor elements on the inside surface of the face plate of a CRT. The mask is fixed to a rectangular frame having corner brackets connected by light-weight diaphragm strips and resilient plates molded to the brackets. The resilient plates have holes toward the distal ends thereof which engage pins embedded in a skirt surrounding the face plate. The plates are precipitation hardened stainless steel having a thickness of 0.20 mm to 0.30 mm and provide sufficient spring force to retain the mask and frame as well as the internal magnetic shield which is fixed to the corner brackets by clips.