GLASS FUNNEL FOR CATHODE-RAY TUBE AND GLASS BULB FOR CATHODE-RAY TUBE

摘要

PROBLEM TO BE SOLVED: To achieve a lighter weight and maintain strength against vacuum breakage. SOLUTION: A thickness S of a seal edge face 3c1 of a funnel 3 is set to be almost equal to a thickness S' of a seal edge face 2b1 of a panel 2. A body portion 3e of the funnel 3 has a first region 3e1 with its size h ranging from the seal edge face 3c1 to a direction parallel to a tube axis Z and a second region 3e2 except the first region 3e1, in a range excluding a corner portion 3a3. The thickness of the second region 3e2 is relatively smaller than the thickness of the first region 3e1. As a result, a boundary between both regions forms a stepped portion 3e3 on the outer face of the body portion 3e.