| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface heater and its heating method, capable of obtaining superior high-speed heating performance, without using a power supply using a complicated control circuit. SOLUTION: A first pair of electrodes 21 and a second pair of electrodes 22 are formed on the obverse, the reverse, or both obverse and reverse of an electric-heating layer 10 so as not to be horizontally overlapped. Each pair of electrodes is connected to a power supply, through a separate switch that can be independently opened and closed. An additional electric-heating layer may be laminated on the surface of the electric-heating layer where the pairs of electrodes are formed, or a base material layer may be laminated on the outermost obverse and the outermost reverse. In its heating method, both pairs of electrodes are energized first to heat the surface heater, a shorter temperature balancing time is measured, when only either one of the pairs of electrodes is energized, and current supply to one pair of electrodes is stopped at a time point before the shorter time to bring temperature balancing conditions to the surface heater.
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