ELECTRIC HEATER FOR EXHAUST GAS PURIFYING DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

PURPOSE: To prevent the occurrence of scoping while a desired electric resistance amount and uniform heat generating ability are ensured. CONSTITUTION: An annular electrode 2 is disposed externally of a rod-form central electrode 1, and by winding a conductive foil around a central electrode 1, a honeycomb-form heat generating substance layer 3 is formed between two electrodes 1 and 2. The each layers of the heat generating substance layer 3 are insulated therebetween and a plurality of virtual joining lines 4 are arranged radially from the central electrode 1 and layers are joined together and electrically connected along the virtual joining line in such a manner that the joining parts 33 are arranged in a zigzagging state at every one layer between the virtual joining lines 4.