Filament unit for retrofit led tube
AssigneePhilips Lighting Holding B.V.
InventorsRaimundo DE HEER GALISTEO, Bernhard Christiaan VAN DIJK, Haimin TAO, Tian Xiang WEN, Sascha KONDIC, Pieter Johannes STOBBELAAR, Paul Robert VELDMAN
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Abstract
The invention relates to a light emitting device (2) for retrofitting a fluorescent lamp comprising two sets of connecting pins (21, 23, 21′, 23′) for connecting the light emitting system (1) to a lighting fixture, one first (611) and one second (613) filament unit, encapsulated in a bulb and fed through it, electrically coupled to the connecting pins (611, 613) and a solid state light source connected between the filament units.
Claims13
A light emitting device for retrofitting a fluorescent lamp comprising a light emitting unit comprising:
- at least a solid state light source,
- two sets of connecting pins for connecting the light emitting device to a lighting fixture, characterized in that
- the light emitting device further comprises at least one filament unit, wherein each set of connecting pins is electrically coupled to the at least one filament unit,
- wherein said filament unit comprises
- at least one first and one second filament unit connecting pins, and
- at least one filament electrically coupled to the filament unit connecting pins, wherein the filament has a positive temperature coefficient, and wherein the filament unit further comprises a bulb encapsulating at least the at least one filament, the filament unit connecting pins being fed through the bulb.
A method for improving compatibility of a light emitting device of solid state light sources with electronic ballasts, comprising electrically coupling at least one filament unit to at least one set of connecting pins of the light emitting device of solid state light source, wherein the filament unit comprises a bulb encapsulating at least one filament which is a traditional filament of lamps and capable of emitting light as current passing through the filament and has a positive temperature coefficient.
Dependencies are inferred from the claim text.