Patent ID: 6890237

Claim:
A method of manufacturing a shadow mask assembly, comprising: applying a preliminary tension force having a magnitude in a range of 9.8 N to 490 N to each of four corners of an approximately rectangular shadow mask, the shadow mask having a perforation region including a plurality of elongated through-holes and having a pair of opposing shorter sides, each of the shorter sides having a curved center recess section, the preliminary tension force being applied in an outward direction aslant with respect to each side of the shadow mask; after said applying of the preliminary tension force, applying a main tension force to each of a pair of opposing sides of the shadow mask in an outward direction perpendicular to the opposing sides; and after said applying of the main tension force, fastening the shadow mask to side members of a support frame while the shadow mask is in the tensioned state, the support frame having an approximately rectangular shape.