| 摘要 |
PROBLEM TO BE SOLVED: To solve problems encountered in the prior art that in a connecting method using plural electric cables a large accommodation space and a large scale equipment are necessitated since a thick electric cable is necessary for sending as large as several hundreds ampere electric current and a longer cable is necessary for permitting elongation due to heat expansion of a hot plate and that in a connecting method using a brush or a screw there occurs ununiform temperature distribution of a board surface of a hot plate due to variation of heat generation brought by variation of electric resistance since contact pressure at a contact portion is liable to become deficient or ununiform to cause excessiveness or a change of electric resistance, the ununiform temperature distribution being caused also by heat radiation from a conductor at an edge of a hot plate. SOLUTION: Sending an electric current to a hot plate is conducted by means of plural contact terminals composed of laminated thin metal plates and further a temperature of a conductor is controlled.
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