Patent ID: 7781951

Claim:
A filament lamp, comprising: an elongated light-emitting lamp tube having hermetically sealed parts formed at each of opposite ends thereof; a plurality of metal foils embedded in each of the hermetically sealed parts of the lamp tube; at least three coil-shaped filaments disposed in sequence in an axial direction of the lamp tube axis, and pairs of internal leads, each lead of which is attached to a respective end of a respective filament, with each internal lead being electrically connected to a respective one of said plurality of sheets of metal foil; wherein the pairs of internal leads attached to both ends of those of the filaments which are disposed in proximity to the hermetically sealed parts extend in the direction of the same hermetically sealed part and are supported by a respective one of the hermetically sealed parts; and wherein the pairs of internal leads attached to the ends of at least one filament that is disposed between the filaments that are proximate the hermetically sealed parts extend in mutually differing directions in the tube axis direction of the light-emitting tube, and each of which is supported by a respective one the hermetically sealed parts.