| 摘要 |
PROBLEM TO BE SOLVED: To suppress an increase in the size of a heating device while raising the calorific value of the heating device. SOLUTION: The heating device 1 has a plurality of coiled sheathed heaters 3, 4 overlapping each other in a multispiral shape. This structure suppresses an increase in the size of the heater device 1 while raising the calorific value of the heating device 1 in comparison with a case where a single sheathed heater is increased in length or outer diameter to raise the calorific value of the heating device 1. COPYRIGHT: (C)2008,JPO&INPIT
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