Laminated ptc thermistor element
AssigneeMurata Manufacturing Co., Ltd.
InventorsWataru Aoto, Yumin Saigo, Hayato Katsu, Yasuhiro Nabika
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Abstract
A laminated PTC thermistor element that includes a ceramic substrate including a plurality of ceramic layers, a plurality of internal electrodes within the ceramic substrate, and external electrodes on the surface of the ceramic substrate that provide electrical conduction to the internal electrodes. The ceramic substrate is 0.3 [μm] or more and 1.2 [μm] or less in average porcelain grain size. Furthermore, the relative density of the ceramic substrate has a lower limit of 70 [%], and an upper limit of −6.43d+97.83 [%] when the average porcelain grain size is denoted by d.
Claims7
A laminated PTC thermistor element comprising:
- a ceramic substrate having a plurality of ceramic layers;
- a plurality of internal electrodes within the ceramic substrate;
- and
- an external electrode on a surface of the ceramic substrate and electrically connected to the internal electrodes,
- wherein the ceramic substrate is 0.3 [μm] or more and 1.2 [μm] or less in average porcelain grain size,
- a relative density of the ceramic substrate has a lower limit of 70 [%], and
- the relative density of the ceramic substrate has an upper limit of −6.43d+97.83 [%] when the average porcelain grain size is denoted by d.
Dependencies are inferred from the claim text.