| 摘要 |
PROBLEM TO BE SOLVED: To secure the safety relating to erectric insulation without using a grounding wire, a transformer or the like. SOLUTION: Second wiring 56 connected with one end part of a cord heater 44 mounted inside of a door 20 is stuck up to a protective material 52, then inserted into an upper conduit tube 50 and pulled out from a door upper end part. Third wiring 58 connected with the other end part of the cord heater 44 is stuck up to the protective material 52, and inserted into a lower conduit tube 50. First wiring 54 is inserted into the upper and lower conduit tubes 50, 50, and connected with the third wiring 58 at its lower end part. Then the first wiring 54 and the second wiring 56 pulled out from the upper conduit tube 50 are connected with a power source unit. Each wiring 54, 56, 58 constituting a lead wire 48 positioned inside of the door 20 is covered with an outer glass plate 40, a protective material 52, the conduit tubes 50, 50, a bearing 60 or a heat insulating material 36 to be doubly insulated. COPYRIGHT: (C)2006,JPO&NCIPI
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