Cathode ray tube with a conical portion

Details Cathode ray tube with a conical portion Cathode ray tube with a conical portion

2008-05-06

2008-05-06

Santiago, Mariccli (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Envelope

C313S490000, C313S440000, C313S634000, C220S00210A

Reexamination Certificate

active

07368865

ABSTRACT:
A display tube has an evacuated envelope with a display panel, a cone (or funnel) portion and a neck portion. The cone portion has a cone body portion and a parabolic portion. The contour of the cone body in a plane through the longitudinal axis of the tube and the short axis of the panel is such that up to at least half the length of the cone body the cone height sinks by maximally 12%. Hereby stresses at the sealing face between the panel and the cone portion arc reduced. More in particular the Z and Y coordinates of the outer contour are such that at 0.5L=Z it holds that 0.88H<Y<H wherein H is the seal edge position on the short panel axis and L is the depth of the cone portion. Preferably the first and second area show a transition point P between 0.5L and 0.8L.

REFERENCES:
patent: 2002/0153823 (2002-10-01), Knoche et al.

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