Patent ID: 7221082

Claim:
A panel for use in a cathode ray tube, comprising: a face portion for displaying picture images, the face portion having first to fourth corner portions; a skirt portion extending backward from a perimeter of the face portion; and a blend radius portion joining the skirt portion to the face portion, wherein average outside curvature radius R (mm) of the face portion satisfies the following relationship: R≧10,000; wedge rate Td/Tc of the face portion satisfies the following relationship: 2.0≦Td/Tc≦2.6; maximum compressive surface stress σC max (MPa) of the face portion and the skirt portion satisfies the following relationship: −30≦σC max ≦−15; and tensile bending stress σbt (MPa) at inner surface of the blend radius portion satisfies the following relationship: σbt≦10.