Fluorescent lamp with UV-blocking layer and protective sleeve
First Claim
1. A sleeve-protected fluorescent lamp comprising a mercury vapor discharge fluorescent lamp surrounded by a sleeve, the fluorescent lamp comprising a light-transmissive glass envelope having an inner surface, a pair of electrode structures mounted inside said envelope, a first base sealing a first end of the lamp, a second base sealing a second end of the lamp, a discharge-sustaining fill comprising inert gas sealed inside said envelope, and a phosphor layer inside said envelope and adjacent the inner surface of the envelope, the sleeve comprising a layer of polymeric material, the sleeve-protected lamp further comprising a UV-blocking layer between the polymeric material layer and the glass envelope, the UV-blocking layer comprising a UV-blocking component of Al2O3 or ZnO or SiO2 or TiO2 or mixtures thereof, the inside diameter of the sleeve being at least 0.2 mm greater than the outside diameter of the lamp so that there is a gap between the lamp and the sleeve, wherein the UV-blocking layer comprises a mixture of Al2O3, ZnO and SiO2.
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Accused Products
Abstract
A fluorescent lamp having a protective polymeric sleeve to provide impact resistance and contain fragments if the lamp shatters. A UV-blocking layer is coated on the outside of the glass envelope of the lamp or on the inside of the sleeve to help protect the polymeric sleeve from UV degradation. The UV-blocking layer includes a UV-blocking component of Al2O3 or ZnO or SiO2 or TiO2 or mixtures thereof.
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Citations
18 Claims
- 1. A sleeve-protected fluorescent lamp comprising a mercury vapor discharge fluorescent lamp surrounded by a sleeve, the fluorescent lamp comprising a light-transmissive glass envelope having an inner surface, a pair of electrode structures mounted inside said envelope, a first base sealing a first end of the lamp, a second base sealing a second end of the lamp, a discharge-sustaining fill comprising inert gas sealed inside said envelope, and a phosphor layer inside said envelope and adjacent the inner surface of the envelope, the sleeve comprising a layer of polymeric material, the sleeve-protected lamp further comprising a UV-blocking layer between the polymeric material layer and the glass envelope, the UV-blocking layer comprising a UV-blocking component of Al2O3 or ZnO or SiO2 or TiO2 or mixtures thereof, the inside diameter of the sleeve being at least 0.2 mm greater than the outside diameter of the lamp so that there is a gap between the lamp and the sleeve, wherein the UV-blocking layer comprises a mixture of Al2O3, ZnO and SiO2.
- 14. A sleeve-protected fluorescent lamp comprising a mercury vapor discharge fluorescent lamp surrounded by a sleeve, the fluorescent lamp comprising a light-transmissive glass envelope having an inner surface, a pair of electrode structures mounted inside said envelope, a first base sealing a first end of the lamp, a second base sealing a second end of the lamp, a discharge-sustaining fill comprising inert gas sealed inside said envelope, and a phosphor layer inside said envelope and adjacent the inner surface of the envelope, the sleeve comprising a layer of polymeric material, the sleeve-protected lamp further comprising a UV-blocking layer between the polymeric material layer and the glass envelope, the UV-blocking layer comprising a UV-blocking component of Al2O3 or ZnO or SiO2 or TiO2 or mixtures thereof, the inside diameter of the sleeve being at least 0.2 mm greater than the outside diameter of the lamp so that there is a gap between the lamp and the sleeve, wherein the UV-blocking layer is a coating on the outside surface of the glass envelope, wherein the UV-blocking layer comprises a mixture of Al2O3, ZnO and SiO2.
Specification