Manufacturing method of picture tube

Details Manufacturing method of picture tube Manufacturing method of picture tube

1994-10-28

1996-08-20

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Process

Implosion protecting

65115, H01J 924

Patent

active

055474098

ABSTRACT:
A glass bulb is physically reinforced to provide a tensile stress in the nearly central portion of wall thickness in the wall thickness direction and to provide a compressive stress on the surface. The physical reinforcement is specifically applied by air cooling reinforcement. The completed CRT is further shrinkage fitted so as to tighten the outer side face of a panel by a metal ring. At the time of the air cooling reinforcement, reinforcement is optimized by reinforcing the glass bulb (or the panel or a funnel) so as to be more effective by adding the stress distribution in a vacuum state of the picture tube having a rectangular screen and by the shrinkage fitting achieved by the metal ring. As a result, the problem of heavy weight, which was one of major defects of mass produced CRTs, is solved while the risk of implosion is still avoided.

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