Electric lamp and discharge devices – Electrode exterior to envelope
Patent
1995-12-21
1997-12-02
Patel, Nimeshkumar
Electric lamp and discharge devices
Electrode exterior to envelope
313607, H01J 6504
Patent
active
056940009
ABSTRACT:
An electrodeless low-pressure discharge lamp (10) according to the invention is provided with a radiation-transmitting discharge vessel (11) which encloses a discharge space (14) containing an ionizable filling in a gastight manner. The lamp (10) is in addition provided with a first and a second winding (20, 23) for conducting a high-frequency current during operation. The first winding (20) extends along a longitudinal axis (29) in a cavity (28) surrounded by the discharge vessel (11). The second winding (23) is arranged along the longitudinal axis (29) in the extended direction of the first winding (20) outside the cavity (18) surrounded by the discharge vessel (11). During operation, the currents in the first and second windings (20, 23) have the same tangential direction relative to the longitudinal axis (29). The lamp causes comparatively little magnetic interference, while it is avoided that the second winding (23) hampers lamp ignition or causes an unstable lamp operation.
REFERENCES:
patent: 4240010 (1980-12-01), Buhrer
patent: 4977354 (1990-12-01), Bergervoet et al.
Antonis Petrus H.
Vegter Klaas
Egbert Walter M.
Patel Nimeshkumar
U.S. Philips Corporation
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