| 摘要 |
<p>PURPOSE: To reduce variation in resistance owing to self-heating and thermal wear for higher reliability by forming an electronic element layer in such a manner that it is superposed on the opposed ends of a pair of lower electrode layers, formed on an insulating substrate, and forming a pair of upper electrode layers in such a manner that they are superposed on either end of the electronic element area and the respective lower electrode layers. CONSTITUTION: A pair of lower electrode layers 3 are formed on the surface of a rectangular alumina substrate 1. A resistor layer 2 is filled in between the lower electrode layers by a thick film forming method in such a manner that it is superposed on the opposed ends of the lower electrode layers 3. Upper electrode layers 4 are formed on the resistor layer 2 and lower electrode layers 3 in such a manner that they covers the overlapped portion of the resistor layer 4 and lower electrode layers 3, and that its length is larger than that M of the overlapped portion. Thus both the ends of the resistor layer 2 is sandwiched between the upper electrode layers 4 and the lower electrode layers 3, and the efficiency of radiating heat produced by energization is thereby improved.</p> |
