PURPOSE: To provide a highly efficient rod PTC heater at a low cost by inserting heater units formed by fixing PTC elements to insulating cases with spring terminals into a hollow body with an opening groove.
CONSTITUTION: An opening groove is provided in a long hollow body 1 formed of aluminum or the like, into which plural heater units each constructed of insulating case 3 with built-in PTC thermistor elements are inserted in the direction of the opening groove. The PTC thermistor element 6 is provided with an electrode layer 7, an insulating plate 5 being provided on one side and an electrode plate 8 being provided via a spring terminal on the other side and fixed to the insulating case 3. When the insulating cases 3 are inserted into the hollow body 1, the insulating plates 5 are engaged with grooves 15 in the insulating cases 3 against the energizing force of the spring terminals and fixed to any position in the hollow body. In this way, the PTC thermistor element can be arranged at any position and a rod PTC heater is obtained which ca reduce its heat contact resistance and effectively derive its property.
NAKANO OSAMU
NISHIFUJI MASANORI
INANAGA KOICHI
