| 摘要 |
PROBLEM TO BE SOLVED: To provide a filament arrangement of an incandescent lamp adequate for usage in combination with a concave reflector. SOLUTION: At least five filament parts are arranged substantially symmetrically in a polygonal shape around an axis of the lamp with vertical axes of the filament parts arranged in parallel. The filament parts are wound with one wire and electrically connected serially through link parts 18, 19, and 20 of the wire extending between corresponding ends of the filament parts. The link parts at two ends of the arrangement are supported by a set of support members 30 and 31 extending from respective frame members 34 and 35. Electric inputs and outputs 14 and 15 of the arrangement transmit through terminal wire parts on both ends and substantial both ends of the arrangement. In the link parts, the set of support members 30 and 31 disposed at respective ends of the arrangement exist on a substantially straight line, and each of frame members 34 and 35 is formed of one straight member.
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