4xc2x0. The border where the first tapered surface 26 meets with the second tapered surface 27 is referred to as a break line 28, which is positioned away from a lower end of the implosion-proof band 50.
When the explosion-proof band 50 is installed around the outer periphery of the skirt portion 23 of the glass bulb 10 after the glass bulb being evacuated, the implosion-proof band 50 expanded by heating is pushed from the side of the face portion 21, and then is fitted around the skirt portion 23. At this time, the mold match line 25 is brought into contact with the implosion-proof band 50, which may incur scratches or/and cracks in the mold match line 25. Therefore, in a case where the mold match line 25distance between a first plane passing through the seal edge and a second plane passing through a center of the face portion, and the mold match line height H1 is a distance between the first plane and a third plane passing through the mold match line.
In accordance with another preferred embodiment of the present invention, there is provided a panel for use in a cathode ray tube, including: a face portion for displaying picture images, whose mean outer radius of curvature is less than 10,000 mm; a skirt portion extending from a periphery of the face portion and having a seal edge sealed to a funnel; and a blend round portion connecting the face portion and the skirt portion, wherein a mold match line is formed on the