Strengthened glass bulb for a cathode ray tube

Details Strengthened glass bulb for a cathode ray tube Strengthened glass bulb for a cathode ray tube

1997-10-27

1999-07-20

O'Shea, Sandra

Electric lamp and discharge devices

Cathode ray tube

Envelope

348821, 220 21A, H01J 3100

Patent

active

059259779

ABSTRACT:
A glass bulb for a cathode ray tube in which a compressive stress is formed in a surface of a panel portion by physically strengthening; the maximum wall thickness t.sub.F of a face portion 7 on at least one axis of a long axis and a short axis of the face portion and the maximum wall thickness t.sub.R of a blend R portion satisfy 1.0.ltoreq.t.sub.R /t.sub.F .ltoreq.1.4; and the absolute value of a compressive stress value by physically strengthening in an area where a tensile vacuum stress is distributed after the assembling of the cathode ray tube is 7-30 MPa, whereby there is a small possibility of implosion of the glass bulb even when the wall thickness of the panel portion is made thin in comparison with a conventional glass bulb.

REFERENCES:
patent: 4537322 (1985-08-01), Okada et al.
patent: 4580077 (1986-04-01), Bakker et al.
patent: 4990825 (1991-02-01), Tsukui et al.
patent: 5814933 (1998-09-01), Iwata et al.

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