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

1996-05-13

1998-03-24

Patel, Nimeshkumar

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313493, 313485, 313486, H01J 168

Patent

active

057316597

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.

REFERENCES:
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patent: 4069441 (1978-01-01), Wanmaker et al.
patent: 4088923 (1978-05-01), Manders
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patent: 4847533 (1989-07-01), Hoffman
patent: 5045752 (1991-09-01), Jansma
patent: 5258689 (1993-11-01), Jansma et al.

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