Glass funnel for a cathode ray tube and process for its...

Details Glass funnel for a cathode ray tube and process for its... Glass funnel for a cathode ray tube and process for its...

2005-01-18

2005-01-18

Patel, Nimeshkumar D. (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Envelope

C313S47700R, C220S00210A, C220S00230A, C445S024000, C445S025000, C065S030130, C065S030110

Reexamination Certificate

active

06844669

ABSTRACT:
A glass funnel for a cathode ray tube, which has a substantially rectangular opened end at one end and a neck portion at the other end and which constitutes, together with a glass panel having a substantially rectangular face portion, a glass bulb to be used for a cathode ray tube, wherein the glass constituting the glass funnel contains, by molar percentage, at least 60% of SiO2and at least 7% of PbO; when the molar percentages of Na2O and K2O contained in said glass are represented by WNa and WK, respectively, 0.35≦WK/(WNa+WK)≦0.6; a compressive stress layer is formed by chemical tempering at least in the outer surface of a region containing a position where the tensile stress formed when the interior of the glass bulb is vacuumed to produce the cathode ray tube, becomes maximum; and either one or both of the outer surface of the chemically tempered region and the inner surface opposite to said outer surface, are colored by ion exchange coloration.

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