Display screen for an image-forming tube in a television or monitor and press apparatus for making same

摘要

The flat display screen for an image-forming tube consists of a front pane portion (2,2′) and a circumferential flange portion (3,3′). The flange portion has an outer surface with a circumferential solder edge (7,7′) on an end of the circumferential flange portion (3,3′) on an opposite side from the front pane portion (2,2′). The outer surface has a circumferential ring-shaped region (5,5′), designated a KC surface, which extends substantially parallel to a central axis (8,8′), which is perpendicular to a surface of the front pane portion (2,2′) passing through a center point on the front pane portion (2,2′). So that the flange portion height can be reduced without increasing the danger of implosion, the wall thickness of the circumferential flange portion (3,3′) of the outer surface between the solder edge (7,7) and the circumferential ring-shaped region (5,5′) is greater than a wall thickness of the circumferential flange portion in the circumferential ring-shaped region (5,5′). In a preferred embodiment the solder edge (7,7′) has a width that is less than the wall thickness of the flange portion (3,3′) between said solder edge (7,7′) and the circumferential ring-shaped region (5,5′). A pressing tool (10,10′) for making the display screen is also described.