Electric lamp

An electric lamp characterized by comprising:

• a bulb comprising a first curved face, the first curved face having a substantially ellipsoidal shape in cross section with a first focal point and a second focal point, and being convex outwardly, and a second curved face, facing the first curved face, the second curved face having a substantially ellipsoidal shape in cross section with a first focal point and a second focal point, and being convex outwardly, and;
• a filament comprising a coil part formed by winding a wire and generating a light by being energized, the filament being so arranged that the coil part is positioned in an inner space of the bulb,
• wherein the respective reflective coatings are formed on the first curved face and the second curved face,
• the reflective coating comprises an opening for passing an emerged light generated at the coil part and reflected on the first curved face or the second curved face,
• the first curved face is so adapted that the first focal point is positioned at the coil part, and the second focal point is positioned at a light transmission medium to which an emerged light generated at the coil part and reflected on the first curved face is provided through the opening, and
• the second curved face is so adapted that the first focal point is positioned at the coil part, and the second focal point is positioned at a light transmission medium to which an emerged light generated at the coil part and reflected on the second curved face is provided through the opening.

A light transmission medium lighting system characterized by comprising an electric lamp and a light transmission medium,

• the electric lamp comprising:
• a bulb comprising a first curved face, the first curved face having a substantially ellipsoidal shape in cross section with a first focal point and a second focal point, and being convex outwardly, and a second face, facing the first curved face;
• a filament comprising a coil part formed by winding a wire and generating a light by being energized, the filament being so arranged that the coil part is positioned in an inner space of the bulb;
• and
• the light transmission medium being arranged in the vicinity of the second face, to which an emerged light generated at the coil part and reflected on the first curved face is provided,
• wherein a reflective coating is formed on the whole of outer surface or the whole of inner surface of the first curved face, and the first curved face is so adapted that the first focal point is positioned at the coil part, and the second focal point is positioned at the light transmission medium.

A light transmission medium lighting system characterized by comprising an electric lamp and two light transmission media,

• the electric lamp comprising:
• a bulb comprising a first curved face, the first curved face having a substantially ellipsoidal shape in cross section with a first focal point and a second focal point, and being convex outwardly, and a second curved face, facing the first curved face, the second curved face having a substantially ellipsoidal shape in cross section with a first focal point and a second focal point, and being convex outwardly, and;
• a filament comprising a coil part formed by winding a wire and generating a light by being energized, the filament being so arranged that the coil part is positioned in an inner space of the bulb;
• and
• the two light transmission media being arranged in the vicinity of the first curved face and the second curved face, respectively, to which an emerged light generated at the coil part and reflected on the first curved face or the second curved face is provided,
• wherein the respective reflective coatings are formed on the first curved face and the second curved face,
• the reflective coating comprises an opening for passing an emerged light generated at the coil part and reflected on the first curved face or the second curved face,
• the first curved face is so adapted that the first focal point is positioned at the coil part, and the second focal point is positioned at one light transmission medium to which an emerged light reflected on the first curved face is provided through the opening, and
• the second curved face is so adapted that the first focal point is positioned at the coil part, and the second focal point is positioned at the other light transmission medium to which an emerged light reflected on the second curved face is provided through the opening.