| 摘要 |
A coiled filament has a light emitter with a reduced volume as best possible to serve in downsizing a light bulb and elevate an illumination with high efficiency in an illuminated field. A flat coiled filament (1) wound into flatness is arranged in the form of a helix or ring, locating the longer axis (FL) of the flatness in parallel with the central axis (CL) of the coiled filament or to cross the central axis (CL) at an appropriate angle (alpha) including right angle. Alternatively, it is arranged in coincident with the radial axis (HL) of the coiled filament or at an appropriate angle (alpha) including the radial axis (HL). Alternatively, the flat coiled filament is U-shaped and a pair of such U-shaped flat coiled filaments (4) are mated with each other through their open ends, while the inner surfaces of their closed ends are kept non-contact with each other. Alternatively, the flat coiled filament (1) is formed circular, and within a circle of such a circular ring-shaped double coiled filament (5, 10, 12), an appropriate number of straight or circular flat coiled filaments (6, 7, 9, 11, 13, 14) are arranged in the central axis (CL) of the circle.
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