Electric incandescent lamp
AssigneeU.S. Philips Corporation
InventorEduard Jozef Philomena Janssen
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Abstract
The invention relates to an electric incandescent lamp having a tubular envelope in which a coiled-coil filament is stretched which is supported in at least one place between the ends by a support formed from wire, of which support a part bears on the inner wall of the envelope and another part supports the filament, The part which supports the filament has a helical shape and, according to the invention, is present inside the secondary winding of the filament. The said part comprises at least two turns the winding sense of which corresponds to that of the secondary turns of the filament.
Claims1
An electric incandescent lamp, in particular a halogen incandescent lamp, comprising a tubular envelope which is closed at both ends by a pinch seal and in which a coiled-coil filament is stretched which extends coaxially in the envelope and which is supported in at least one place between the pinch seals by a support which is formed from a metal wire, of which support a first helically wound part supports the filament and a second part bears on the inner wall of the envelope, characterized in that the first part comprises at least two turns, the winding sense of which corresponds to that of the secondary winding of the filament and which part is present inside the secondary winding of the filament.
Dependencies are inferred from the claim text.