Murata Manufacturing Co., Ltd.

Shinichiro Nawai

Tadamasa Miura

Yuichi Hirata

A thermistor element satisfies 4&#x2264;(d/ed) when a first distance is d, which is a shortest distance between a first internal electrode and a second external electrode, whereas a second distance is referred to as ed, which is a shortest distance between the first internal electrode and a fifth internal electrode, in a cross section of a body including an L direction and a T direction thereof.

Thermistor element

A thermal sensor that includes a ceramic body formed of NTC thermister ceramic, heat sensing part electrodes, temperature compensation part electrodes, external electrodes, and a cavity. A heat sensing part, which is the surface layer of the ceramic body, is heated by, for example, radiant heat transfer, reducing the resistance value of a thermister ceramic layer between the heat sensing part electrodes. Since the heat of the heat sensing part of the ceramic body is insulated by the cavity and thus prevented from diffusing, the heat capacity of the heat sensing unit is reduced, obtaining high sensitivity and high responsiveness.

Thermal sensor, non-contact thermometer device, and non-contact temperature measurement method

A surface-mount negative-characteristic thermistor includes a ceramic body composed of a semiconductor ceramic material including at least one of Mn, Ni, and Ti; external electrodes disposed on surfaces of the ceramic body; and plating films disposed on surfaces of the external electrodes. When the molar quantity of Mn in the semiconductor ceramic material is represented by a and when the molar quantity of Ni in the semiconductor ceramic material is represented by b, the molar ratio of Mn to Ni is in the range of 55/45&#x2266;a/b&#x2266;90/10, and when the total molar quantity of Mn and Ni in the semiconductor ceramic material is defined as 100 parts by mole, the content of Ti is in the range of about 0.5 parts by mole to about 25 parts by mole.

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Nagaokakyo, Japan

Shinichiro Nawai