High pressure sodium vapor lamp with improved ceramic arc tube

Details High pressure sodium vapor lamp with improved ceramic arc tube High pressure sodium vapor lamp with improved ceramic arc tube

H - Electricity

01

J

313/10, 316/19

H01J 9/24 (2006.01) H01J 61/22 (2006.01) H01J 61/36 (2006.01)

Patent

CA 1241691

HIGH PRESSURE SODIUM VAPOR LAMP WITH IMPROVED CERAMIC ARC TUBE ABSTRACT OF DISCLOSURE An improved high pressure sodium lamp is described utilizing a polycrystalline alumina arc tube that is hermetically sealed, at least at one end, with a polycrystalline alumina end closure. Said end closure novel member is shaped as a flat disc having the contour and size permitting partial insertion into the internal opening of said arc tube, along with having a larger size projection located adjacent one major surface of said disc externally of said arc tube and with said disc being hermetically sealed directly to said arc tube. In a preferred embodiment, said end enclosure member further includes a central aperture through which extends one of the thermionic electrodes contained within said arc tube.

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