GLASS BULB FOR CATHODE RAY TUBE

PURPOSE: Disclosed is a glass bulb for a cathode ray tube capable of enduring a static fracture owing to the pneumatic pressure difference and an outside mechanical shock by creating a proper compressive stress. CONSTITUTION: The glass bulb(10) for a cathode ray tube comprises a panel(12), a funnel(28) which is engaged with a panel(12). The compressive stress(σcs) applied to the panel(12) at a position, in which the maximum vacuum tensile stress(σTS) is created owing to the pneumatic pressure difference of between the inner surface and the outer surface of the galss bulb(10), is determined by the following equation: ((σTS-σBS)/3)=< σCS =< σTS, where (σBS) is the glass bulb fracture strength. At this time, the glass bulb fracture strength(σBS) is determined by the following equation: (σ BS)/3