Patent ID: 8014652

Claim:
A filament lamp, comprising: a light emitting tube which is formed with a hermetic seal area on at least one end; multiple filament assemblies, each filament assembly comprising a coiled filament and connected leads to supply power to that filament, within said light emitting tube, the filaments being sequentially arranged in the axial direction of the light emitting tube, the leads of each filament assembly being electrically connected to respective multiple conductive pieces located in the seal area, and power being independently suppliable to each of the filaments; an insulating wall provided within the light emitting tube between the filaments and leads, the insulating wall having openings, located along the tube axis in proximity to the inner wall of the light emitting tube, and multiple lead accommodation spaces, corresponding to the number of leads, formed to extend along the tube axis of the light emitting tube and divided by the light emitting tube and the insulating walls, wherein each lead connected to a filament passes through one of the openings in the insulating wall and is placed without short circuits in one of the lead accommodation spaces.