Fluorescent lamp discharge tube having electrostatically coated

Details Fluorescent lamp discharge tube having electrostatically coated Fluorescent lamp discharge tube having electrostatically coated

1987-12-28

1990-04-03

Yusko, Donald J.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313485, 427 67, 65 601, 65 603, 65 6052, 356 731, H01J 164

Patent

active

049147234

ABSTRACT:
A fluorescent lamp discharge tube has an electrostatically coated envelope. The coating comprises a mixture of 100 parts by weight of phosphor, 0.01 to 3 parts by weight of a fatty acid having a melting point greater than 40.degree. C. or the ammonium, aluminum alkaline earth salts thereof, and 0.05 to 5 parts by weight of finely divided aluminum oxide having a grain size smaller than 0.1 micron. The phosphor is applied to the tube by a venturi effect and results in a more uniformly applied coating than is provided using a suspension coating. Uniformity of the coating is measured by the disclosed optical densitometry test.

REFERENCES:
patent: 2426016 (1947-08-01), Gustin et al.
patent: 3894806 (1975-07-01), Remy et al.
patent: 4081714 (1978-03-01), Mossel et al.
patent: 4404255 (1983-09-01), Peiffer et al.
patent: 4501492 (1985-02-01), Douklias

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