Fluorescent lamp with phosphor coating of multiple layers

Details Fluorescent lamp with phosphor coating of multiple layers Fluorescent lamp with phosphor coating of multiple layers

1997-10-24

1999-08-31

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Process

Combined, e.g., with shaping of lamp or device envelope

445 26, H01J 6142, H01J 922

Patent

active

059445726

ABSTRACT:
A low pressure mercury vapor discharge lamp is provided, having a non-straight glass envelope and a plurality of rare earth phosphor layers coated inside the glass envelope. The lamp is made by coating a plurality of rare earth phosphor layers inside a straight glass tube. The tube is then formed into a non-straight configuration, each layer being sufficiently thin so that the phosphor coating does not flake off in sections where the tube is bent around a radius of curvature. A plurality of thin rare earth phosphor layers will not flake off in the bent section whereas a single thick rare earth phosphor layer will flake off. The invention is particularly useful in the manufacture of helical compact fluorescent lamps.

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