EP 0594245 A1 19940427 - Illumination unit, and electrodeless low-pressure discharge lamp and coil suitable for use therein.
Title (en)
Illumination unit, and electrodeless low-pressure discharge lamp and coil suitable for use therein.
Title (de)
Beleuchtungseinheit, elektrodenlose Niederdruck-Entladungslampe und Spule zur Anwendung in einer solchen Lampe.
Title (fr)
Ensemble d'illumination, lampe à décharge basse pression sans électrode et bobine apte à l'utilisation dans ce type de lampe.
Publication
Application
Priority
- EP 93202877 A 19931013
- EP 92203222 A 19921021
Abstract (en)
An illumination unit of the invention comprises an electrodeless low-pressure discharge-lamp (10) and a high-frequency power supply (50). The lamp (10) is provided with a gastight closed discharge vessel (20) with an ionisable fill (21). The lamp (10) further is provided with a coil (30) with turns (31,32) of a primary and a secondary winding (33,34). The power supply unit 50 is provided with input terminals (51a,51b) and is further provided with a first output terminal (52a), electrically neutral with respect to mass, that is connected to a first end (36a) of the primary winding (33) and with a further output terminal (52b) that is connected to a second end (36b) of the primary winding (33). During nominal operation of the lamp (10) the primary winding (33) excites a high-frequency magnetic field that maintains a electrical discharge in the discharge vessel (20) and that induces in the secundary winding (34) a potential drop in the direction of a first, with respect to the mass electrically neutral end (37a), to a second free end (37b) that varies in an opposite sense to the potential drop from the first to second end (36a, 36b) in the first winding (33). In a first end portion (39a) of the coil (30) that comprises half of the turns of the coil (30), the relative amount of turns (31) of the primary winding (33) is at least 3/2 times as large as the relative amount of turns (32) of the secondary winding (34). The measure of the invention improves the ignition speed of the lamp. <IMAGE>
IPC 1-7
IPC 8 full level
H01J 65/04 (2006.01)
CPC (source: EP)
H01J 65/048 (2013.01)
Citation (search report)
- [A] EP 0332263 A1 19890913 - PHILIPS NV [NL]
- [A] PATENT ABSTRACTS OF JAPAN vol. 4, no. 71 (E - 12) 24 May 1980 (1980-05-24)
Designated contracting state (EPC)
BE DE ES FR GB IT NL
DOCDB simple family (publication)
DOCDB simple family (application)
EP 93202877 A 19931013