Patent ID: 6133821
Filing Date: 2000-10-17
Classification: H01C

Abstract:
A PTC thermistor comprising:a PTC thermistor main body having a pair of first main surface and second main surface and a side surface connecting said pair of main surfaces and extending in a normal direction to said main surfaces;a first electrode on said first main surface; anda second electrode on said second main surface;wherein said main body is structured so as to have specific resistance which varies non-symmetrically in said normal direction between said surface such that during an initial period after a potential difference is applied between said first electrode and said second electrode said side surface has a temperature distribution which is asymmetric in said normal direction between said first main surface and said second main surface and that said side surface has a peak heat-emitting region which is significantly closer to either one than the other of said pair of main surfaces; andwherein said PTC thermistor has a significantly larger resistance against flash pressure than if said temperature distribution were not asymmetric.