Ngk Spark Plug Company, Limited

Takaaki Chosokabe

Masaki Iwaya

Masahiko Nishi

Go Hanzawa

Naoki Yamada

Hitoshi Yokoi

Masamichi Ito

Wakako Takano

Masaru Hayakawa

Masaki c/o Ngk Spark Plug Co Ltd Iwaya

In a temperature sensor (), a pair of electrode wires () of a thermistor element () are formed of a material prepared by adding strontium to platinum or a platinum alloy and without addition of zirconia or a like oxide. Rear end portions of the electrode wires () formed of the above-mentioned material and front end portions of sheath core wires () are laser-welded to one another in an overlapping condition.

Temperature sensor

A sintered body for thermistor element of the invention is a sintered body for thermistor element containing Sr, Y, Mn, Al, Fe, and O, wherein not only respective liquid crystal phases of a perovskite type oxide and a garnet type oxide are contained, but also a liquid crystal phase of at least one of an Sr&#x2014;Al based oxide and an Sr&#x2014;Fe based oxide. FeYOand/or AlYOis selected as the foregoing perovskite type oxide, and at least one member selected from YAlO, AlFeYO, and AlFeYOis selected as the foregoing garnet type oxide, respectively by the powder X-ray diffraction analysis.

Sintered compact for thermistor element, process for producing the same, thermistor element and temperature sensor

A sintered body for thermistor device comprising: at least one element selected from elements of group 3 in a periodic table proviso that La is excluded; at least one element selected from elements of group 2 in a periodic table; Mn; Al; and oxygen, and being substantially free from any transition metal other than Mn and the at least one element selected from elements of group 3 in the periodic table.

Sintered body for thermistor devices, thermistor device and temperature sensor

A temperature sensor () including a cylindrical metal tube () having a front end side blocked, a thermistor element (), and a sheath member () connected to the thermistor element () and held in the inside of the metal tube (), wherein: the metal tube () has a small-diameter portion () located on the front end side and entirely having an inner diameter smaller than the outer diameter of the sheath member (), and a large-diameter portion () located on the rear end side of the small-diameter portion () and having a diameter larger than the outer diameter of the small-diameter portion (); and a thermistor sintered body () is held in the small-diameter portion () and cement () is filled in between a front end of the thermistor sintered body () and a front end of an inner wall of the metal tube () and on the front end side viewed from a rear end surface of the thermistor sintered body ().

Temperature sensor with quick response

A temperature sensor comprising: a housing; a thermo-sensitive element housed in the housing for outputting electric characteristics varying with a temperature, as an electric signal; and a pair of lead wires connected at their one-side ends with the thermo-sensitive element for extracting the electric signal from the thermo-sensitive element to an outside of the housing, wherein at least one of the lead wires is made of a mixed twisted wire including: first electric wires made of a first conductor containing copper; and second electric wires made of a second conductor having a higher bending resistance and a tensile strength than those of the first conductor.

A cylindrical metal tube () accommodating therein a thermistor device (), the electric characteristics of which change with temperature, is pushed into, or clamped and fixed to, a sheath portion () positioned on a flange () to the rear of a projection portion () of the flange (), and is laser welded in a circumferential direction. A weld portion (L) formed to bridge the metal tube () and the sheath portion () of the flange () firmly fixes the metal tube () to the flange (). In the temperature sensor () having this construction, the weld portion (L) between the metal tube () and the flange () is not exposed to a high temperature environment. Therefore, oxidation hardly occurs at the weld portion and reliability of air tightness to an exhaust gas can be improved.

Growing community of inventors

Aichi, Japan

Takaaki Chosokabe