| 摘要 |
PROBLEM TO BE SOLVED: To provide a filament coil short-circuiting preventing structure for industrial heater lamps. SOLUTION: In this heater lamp wherein a plurality of filaments are arranged in the axial direction in its tubular bulb, the filaments are built of filament wires wound into multiplex coils. In the structure,ϕAn =ϕAn-1 , and An L≠An-1 L orθAn≠θAn-1 B, where the outer filament is An and the filament inside the outer filament An is An-1 ; the strand diameter of the filament An isϕAn , the pitch of the filament coil winding is AnL, and the angle of the filament coil winding isθAn ; and the strand diameter of the filament An-1 isϕAn-1 , the pitch of the filament coil winding is An-1 L, and the angle of the filament coil winding isθAn-1 .
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