| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To suppress a temperature rise in a region forming a paper non-passing part while using an inexpensive material having a TCR of negative characteristics for a heat generating resistor. <P>SOLUTION: Heat generating resistors 16, 18 having widths in the longitudinal direction of a long flat plate-like insulating substrate 11 made of ceramic and having lengths in its short direction are formed in the longitudinal direction on the substrate. The heat generating resistors 16, 18 are connected in series by a connecting conductor 17. One end of the heat generating resistor 16 is connected to the connecting conductor 17 while the other end is connected to an electrode 12 for power supply through a connecting conductor 14 and one end of the heat generating resistor 18 is connected to the connecting conductor 17 while the other end is connected to an electrode 13 for power supply through a connecting conductor 15. The heat generating resistor 16 has a negative temperature coefficient of resistance, and a narrowed width part 161 is formed in the center part of the longitudinal direction of the insulating substrate, and wide width parts 162, 163 made wider than the narrow width part 161 are formed at its both ends. The heat generating resistor 18 has a negative temperature coefficient of resistance, and a narrowed width part 181 is formed in the center part of the longitudinal direction of the insulating substrate, and wide width parts 182, 183 made wider than the narrow width part 181 are formed at its both ends. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
