Filament lamp comprising two coiled filaments and a lamp assembly
AssigneeKoninklijke Philips Electronics N.V.
InventorCornelis Versluijs
Life of this patent
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Abstract
A filament lamp comprising a sealed transparent vessel (1) containing at least two coiled filaments (3,4) and conductive means (5,6,7;8,9,10;11,12,13) for supplying electric power to each of the at least two coils (3,4). The coils (3,4) are positioned coaxially, and has different diameters. At least a portion of the coil (3) having the larger diameter surrounds at least a portion of the coil (4) having the smaller diameter.
Claims8
A filament lamp comprising a sealed transparent vessel 1 containing at least two coiled filaments (3,4) and conductive means (5,6,7;8,9,10;11,12,13) for supplying electric power to each of the at least two coils (3,4), characterized in that two coils (3,4) are positioned coaxially, and in that the two coils (3,4) has different diameters, and in that at least a portion of the coil (3) having the larger diameter surrounds at least a portion of the coil (4) having the smaller diameter.
A lamp assembly comprising a filament lamp (1,2) and a reflector (14) for producing a diverging beam of light radiation, whereby the filament lamp comprises a sealed transparent vessel (1) containing a coiled filament and conductive means (5,6,7;8,9,10;11,12,13) for supplying electric power to the coil, characterized in that the transparent vessel (1) contains two coils (3,4), both positioned coaxially with respect to the reflector (14), and in that the two coils (3,4) has different diameters, and in that at least a portion of the coil (3) having the larger diameter surrounds at least a portion of the coil (4) having the smaller diameter.
Dependencies are inferred from the claim text.