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US 5,182,490 AGranted
Light sources
AssigneeThorn EMI plc
InventorsJohn G. Holden, Ian A. Shanks
Life of this patent
Estimating the term…
Abstract
A fluorescent tube (2) is made of a plastics material containing at least one organic fluorescent dye and attached to the inner surface of this tube is a barrier layer (3) for absorbing ultraviolet radiation, and attached to the inner surface of the layer (3) there is a phosphor layer (3a).
Claims11
A light source comprising
- a) a hollow support body made of a first main layer of plastics material containing at least one organic fluorescent dye, a second layer of inorganic material deposited on the inner surface of said first layer, and a third layer of a phosphor material attached to the inner surface of the second layer;
- b) thermionic electron source excitation means;
- c) fixing means for fixing said thermionic electron source excitation means to said support body;
- said second layer of inorganic material serving as a barrier layer for absorbing ultraviolet radiation generated by said excitation means.
1 more element
Dependencies are inferred from the claim text.