Method of manufacturing a display tube

Details Method of manufacturing a display tube Method of manufacturing a display tube

H - Electricity

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H01J 9/24 (2006.01) C03B 25/00 (2006.01) C03B 29/06 (2006.01) H01J 9/38 (2006.01)

Patent

CA 1194095

"ABSTRACT" "Method of manufacturing a display tube". Upon adhering the display screen to the cone and upon evacuating the display tube, the display screen and the cone are subjected to temperature treatments in which stresses occur in the display screen which may cause fracture of the display tube. In order to reduce the possibility of fracture, during the temperature treatment measures are taken which influence the temperature dis- tribution over the display screen and the cone in such anner that the occurrence of stresses in the display screen is counteracted. In an embodiment, in the furnace 60 for adhering the display screen 41 to the cone 42, a heat shield 46 is provided at some distance above the central part of the display screen 41. As a result of the heat shield 46, fewer tubulences of the heated air occur at the central part of the display screen 41, with which the dis- play tube 40 is warmed up and which is conveyed from the neck 43 past the display tube 40. The display screen 41 thus is warmed up more slowly, which considerably reduces the value of the stresses occurring in the display screen 41.

398085

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