Electric lamp or space discharge component or device manufacturi – Process – With coating – e.g. – providing protective coating on...
Patent
1989-06-12
1990-05-08
Ramsey, Kenneth J.
Electric lamp or space discharge component or device manufacturi
Process
With coating, e.g., providing protective coating on...
427 67, H01J 170
Patent
active
049234250
ABSTRACT:
A method for making a fluorescent lamp having a CRI approximately the same as the CRI of the lamp phosphor is disclosed. The method includes applying a coating comprising fine particle-size silica to the inner surface of the lamp envelope to form a coated envelope, the coating having a coating weight greater than 0.7 milligrams per square centimeter and less than the weight at which lumen output of the lamp is reduced due to absorption of visible wavelength light by the silica. A coating of phosphor selected to provide a predetermined CRI is applied over the silica layer; and the coated phosphor envelope is processed into a finished lamp. A fluorescent lamp having a CRI approximately equal to the CRI of the lamp phosphor is also disclosed. The lamp of the present invention includes a lamp envelope having an inner surface; a layer of fine particle-size silica disposed on the inner surface of the lamp envelope, the silica layer containing greater than about 0.7 mg/cm.sup.2 of fine particle-size silica; and a coating of phosphor selected to provide a predetermined CRI disposed over the silica layer, the fluorescent lamp having a CRI approximately the same as the CRI of the phosphor.
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Finnegan Martha Ann
GTE Products Corporation
Ramsey Kenneth J.
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