| 摘要 |
PROBLEM TO BE SOLVED: To prevent a heater from cracking by restraining quick temperature change on an end of the ceramic heater. SOLUTION: Heating resistors 12, 13 are formed in parallel with a longitudinal direction of an elongated ceramic substrate 11. Electrodes 14, 15 for current conduction are connected with one ends of the heating resistors 12, 13, a connection conductor 16 is connected with the other end of the heating resistors 12, 13, and the heating resistors 12, 13 are connected in series. End heating resistors 121, 122 which are gradually widened from the heating resistor 12 at end zones S1, S2 are integrally formed on both ends of the heating resistor 12. End heating resistors 131, 132 which are gradually widened from the heating resistor 13 at the end zones S1, S2 are integrally formed on both ends of the heating resistor 13. The heating resistors, the end heating resistors, and the connection conductor are covered with an overcoat layer 17 in order to protect them. Resistance values of the end heating resistors 121, 122 located at an upstream side at the time of passing a record paper are set up to be lower in comparison with those of the end heating resistors 131, 132 in order to reduce temperature. COPYRIGHT: (C)2011,JPO&INPIT |
