A phosphor coating arrangement for an electrodeless...

H - Electricity – 01 – J

Patent

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Details

H01J 65/04 (2006.01) H01J 61/42 (2006.01) H01J 61/56 (2006.01)

Patent

CA 2164711

An electrodeless discharge lamp (10) having a lamp envelope (12) containing a fill of mercury and a rare gas is excitable to a discharge state by introduction of RF energy in close proximity thereto. A ballast circuit contained within the housing base portion (22) of the lamp is effective for generating the RF energy from conventional line power. The ballast circuit includes a core portion which extends within a re-entrant cavity (16) formed within the lamp envelope. During operation of the lamp, the re-entrant cavity portion is exposed to higher wall loading conditions than is the outer surface of the lamp envelope. These higher wall loading conditions require the use of comparatively more expensive rare earth phosphors (30) at the re-entrant cavity portion than are needed on the outer portion of the lamp envelope where it would be appropriate to utilize conventional halophosphate materials (32). In order to provide for two distinct phosphor coating materials in a single lamp envelope configuration and at a reasonable cost, such phosphor coating is done by coating the re-entrant cavity and the outer portion separately and then joining these components together to produce the finished lamp envelope. The juncture point between the re-entrant portion and the outer envelope portion resides under an upper rim portion of the housing and is therefore not visible in the end lamp product.

L'invention concerne une lampe à décharge (10) sans électrode constituée d'une enveloppe (12) contenant du mercure et un gaz rare et pouvant être excitée jusqu'à atteindre la décharge par application d'énergie HF. Un circuit de protection situé à l'intérieur de la base du boîtier (22) de la lampe est destiné à produire de l'énergie HF à partir d'une source d'alimentation classique. Le circuit de protection comprend une partie formant noyau traversant une cavité rentrante (16) formée à l'intérieur de l'enveloppe. Lors du fonctionnement de la lampe, la cavité rentrante est exposée à des conditions de charge plus fortes au niveau de ses parois qu'à la surface externe de l'enveloppe. Ces conditions de charge supérieures des parois nécessitent l'utilisation de phosphores (30) de terres rares de coût comparativement plus élevé au niveau de la cavité rentrante que sur la partie externe de l'enveloppe, là où il conviendrait d'utiliser des matériaux halophosphates classiques (32). Afin d'obtenir deux couches de phosphore différentes sur une enveloppe unique à un coût raisonnable, on effectue séparément le dépôt de la couche de phosphore sur la cavité rentrante et sur la partie externe, puis on les assemble afin d'obtenir l'enveloppe finie. Le point de jonction entre la partie rentrante et l'enveloppe externe se situe sous une partie du bord supérieur du culot de la lampe et n'est donc pas visible sur le produit fini.

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