Methods of electrostatically coating phosphor onto envelopes...

Details Methods of electrostatically coating phosphor onto envelopes... Methods of electrostatically coating phosphor onto envelopes...

H - Electricity

01

J

117/19, 313/81

H01J 9/22 (2006.01)

Patent

CA 1242618

: 11 : ABSTRACT OF THE DISCLOSURE The invention provides a method of electrostatically coating a tubular glass envelope with phosphor for a filament lamp. The phospor 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°C or the ammonium, aluminium alkaline earth salts thereof, 0.05 to 5 parts by weight of finely divided aluminium 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 to suspension coating. Uniformity of the coating is measured by the disclosed optical densitometry test.

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