EP 0702846 B1 19990915 - A PHOSPHOR COATING ARRANGEMENT FOR AN ELECTRODELESS DISCHARGE LAMP
Title (en)
A PHOSPHOR COATING ARRANGEMENT FOR AN ELECTRODELESS DISCHARGE LAMP
Title (de)
PHOSPHORBESCHICHTUNGSEINRICHTUNG FÜR ELEKTRODENLOSE ENTLADUNGSLAMPE
Title (fr)
COUCHE DE PHOSPHORE POUR LAMPE A DECHARGE SANS ELECTRODE
Publication
Application
Priority
- GB 9407128 A 19940411
- GB 9500799 W 19950406
Abstract (en)
[origin: WO9527999A1] 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.
IPC 1-7
IPC 8 full level
H01J 61/42 (2006.01); H01J 61/44 (2006.01); H01J 61/56 (2006.01); H01J 65/04 (2006.01)
CPC (source: EP)
H01J 61/42 (2013.01); H01J 61/56 (2013.01); H01J 65/048 (2013.01)
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
WO 9527999 A1 19951019; CA 2164711 A1 19951019; DE 69512166 D1 19991021; DE 69512166 T2 20000531; EP 0702846 A1 19960327; EP 0702846 B1 19990915; GB 9407128 D0 19940601; JP 2006059819 A 20060302; JP H08511652 A 19961203
DOCDB simple family (application)
GB 9500799 W 19950406; CA 2164711 A 19950406; DE 69512166 T 19950406; EP 95914458 A 19950406; GB 9407128 A 19940411; JP 2005274109 A 20050921; JP 52616995 A 19950406