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1. (WO2001006817) A BALLAST NOISE REDUCTION SCHEME

Pub. No.:    WO/2001/006817    International Application No.:    PCT/EP2000/006629
Publication Date: Fri Jan 26 00:59:59 CET 2001 International Filing Date: Thu Jul 13 01:59:59 CEST 2000
IPC: H05B 41/02
Applicants: KONINKLIJKE PHILIPS ELECTRONICS N.V.
Inventors: JANSEN, Frans
REINKEN, Allan, J.
WOZNICZKA, George
Title: A BALLAST NOISE REDUCTION SCHEME
Abstract:
A ballast having a housing with an open bottom and a plate secured to the housing and covering at least the open bottom. A plurality of components positioned within the housing are surrounded by a potting material. The plate is substantially flat except for a plurality of protrusions extending into the housing. The potting material is displaced by the protrusions so as to substantially eliminate any gaps between the potting material and the plate. The protrusions decrease the volume of the potting material by displacing the latter. There is far less chance of any gap existing between the potting material and the plate since the potting material spreads more evenly/uniformly. Ballast vibrations due to the plate being able to move about during ballast operation are substantially lessened. A substantial reduction in undesirable and distinctive humming sounds result.