Unsaturated vapor pressure type high pressure sodium lamp

Details Unsaturated vapor pressure type high pressure sodium lamp Unsaturated vapor pressure type high pressure sodium lamp

1995-07-18

1996-10-15

O'Shea, Sandra L.

Electric lamp and discharge devices

With gas or vapor

Having electrode lead-in or electrode support sealed to...

313332, H01J 1718

Patent

active

055657354

ABSTRACT:
In an unsaturated vapor pressure type high sodium lamp, a glass solder used for closely sealing a cap to fix to an arc tube includes a first component which is a mixture of Al.sub.2 O.sub.3, CaO and Y.sub.2 O.sub.3, and a second component including at least one of Sc.sub.2 O.sub.3, La.sub.2 O.sub.3, Sm.sub.2 O.sub.3, Ce.sub.2 O.sub.3, Yb.sub.2 O.sub.3 and Dy.sub.2 O.sub.3 ; and a constant percentage of the second component in the glass solder is in a range of 2 to 15 weight %.

REFERENCES:
patent: 4742269 (1988-05-01), Izumiya et al.
patent: 5001396 (1991-03-01), Snellgrove et al.

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