Lamp envelope having a luminescent material on the interior surf

Details Lamp envelope having a luminescent material on the interior surf Lamp envelope having a luminescent material on the interior surf

1987-12-11

1990-04-03

Wieder, Kenneth

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313635, 427 64, H01J 6142, H01J 6146

Patent

active

049143468

ABSTRACT:
Heavy weights of luminescent material; e.g., from 0.0087 to 0.010 g/cm.sup.2, can be applied and adhered to the interior surface of lamp envelopes by mixing with the material up to 20% by weight boric acid. The material and boric acid are applied by electrostatic deposition and the envelope containing the material is then heated to a temperature of at least 300.degree. C. to convert the boric acid to boron anhydride. The envelope is subsequently cooled and employed with a light source capsule to form a lamp.

REFERENCES:
patent: 3602757 (1971-08-01), Wachtel
patent: 3679452 (1972-07-01), Ropp
patent: 3825792 (1974-07-01), Rokosz et al.

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