| 摘要 |
An electric lamp ( 1 ) according to the present invention is so constructed that it comprises a bulb ( 2 ) comprising a first curved face ( 10 ), the first curved face having a substantially ellipsoidal shape in cross section with a first focal point (F 1 ) and a second focal point (F 2 ), and being convex outwardly, and a filament ( 6 ) comprising a coil part ( 16 ) formed by winding a wire and generating a light by being energized, the filament being so arranged that the coil part ( 16 ) is positioned in an inner space ( 5 ) of the bulb ( 2 ), wherein a reflective coating is formed on the whole of outer surface or the whole of inner surface of the first curved face ( 10 ), and wherein the first curved face ( 10 ) is so adapted that the first focal point (F 1 ) is positioned at the coil part ( 16 ), and the second focal point (F 2 ) is positioned at a light transmission medium ( 20 ) to which an emerged light generated at the coil part ( 16 ) and reflected on the first curved face ( 10 ) is provided.
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