Positive temperature characteristic thermistor and thermistor el

Details Positive temperature characteristic thermistor and thermistor el Positive temperature characteristic thermistor and thermistor el

1997-05-15

1999-08-17

Walberg, Teresa

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

H01C 710

Patent

active

059399724

ABSTRACT:
A thermistor element with positive temperature characteristic (PTC) has a planar ceramic member with a positive temperature characteristic of which the thickness is greater at its peripheral part than at the center part, decreasing either gradually or in a stepwise manner. Protrusions may be formed along its periphery. A PTC thermistor is formed with electrodes formed on both main surfaces of such a PTC thermistor, each electrode having a lower-layer electrode all over a main surface and an upper-layer electrode on the lower-layer electrode. The upper-layer electrode has a smaller surface area than the lower-layer electrode such that a portion of the lower-surface electrode is exposed at the periphery. The upper-layer electrodes may be formed at the center parts of the main surfaces, exclusive of the peripheral parts or where the protrusions are formed. The lower-layer electrodes may be mostly of Ni and the upper-layer electrodes mainly of Ag.

REFERENCES:
patent: 3798415 (1974-03-01), Graham et al.
patent: 4330703 (1982-05-01), Horsma et al.
patent: 4590489 (1986-05-01), Tsumura et al.
patent: 4720624 (1988-01-01), Kikuchi et al.
patent: 5267005 (1993-11-01), Yamamoto et al.
patent: 5557251 (1996-09-01), Takaoka

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