Patent ID: 8145045

Claim:
A filament lamp, comprising: a bulb comprised of a straight light emitting tube and a pair of flat hermetically sealed portions continuously formed at each of opposite ends of the light emitting tube, a plurality of coiled filaments sequentially aligned and arranged in a tube axis direction within the light emitting tube, a pair of internal leads, each of which is connected to a respective one of the ends of the filament, a plurality of metal foils spaced from each other, embedded in the hermetically sealed portions, and connected to the internal leads, and external leads connected to the metal foils, wherein the hermetically sealed portions are wider than the external diameter of the light emitting tube; and wherein the width, in a direction at right angles of the tube axis and defined between two parallel lines extending in the tube axis direction, between outer margins of two of the metal foils arranged at opposite ends of each hermetically sealed portion in the direction at right angles of the tube axis is greater than the internal diameter of the light emitting tube.