| 摘要 |
PROBLEM TO BE SOLVED: To provide an incandescent lamp, capable of preventing a possibility that a filament of the incandescent lamp is projected on a floodlighting surface at least at a spot focus position, without causing deterioration in the efficiency of light intensity, when performing lighting for stage effects by a single-lens spotlight, and widening the adjusting range of a floodlighting diameter. SOLUTION: A frost processing section 10, facing a light-emitting section 7, is provided on a glass bulb surface 5a. The frost processing section 10 is formed within a range, wherein lines connecting between the outer periphery of the light-emitting section 7 and the outer periphery of the frost processing section 10 has a three-dimensional angle (effective incident three-dimensional angle) of effective incident light that is irradiated from the light-emitting section 7 to a lens 3 on the single-lens spotlight having the incandescent lamp 1. COPYRIGHT: (C)2009,JPO&INPIT
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