Patent ID: 9417135
Filing Date: 2016-08-16
CPC Classification: G01K

Claim Text:
1. A temperature sensor comprising: a thermo-sensitive element whose electrical characteristics vary depending on temperature; a pair of electrode wires electrically connected to the thermo-sensitive element; and a sheath pin including a pair of signal wires which are overlapped with and connected to the pair of the electrode wires respectively, and accommodated in a state of being exposed to a front side of the temperature sensor on which the thermo-sensitive element is disposed; wherein the electrode wires are made of a metal material consisting primarily of Pt, the signal wires are made of a Ni-based alloy containing 1.0 to 1.7 mass % of Al and having a linear thermal expansion coefficient larger than a linear thermal expansion coefficient of the metal material forming the electrode wires, a junction part is present in an overlap portion of the electrode wires and the signal wires, the junction part being formed by partially melting and thereafter coagulating the electrode wires and the signal wires, the junction part includes a first oxidation film containing Al and having a thickness in a range of 1 to 50 μm at a surface thereof, and the signal wires are coated with a second oxidation film containing Al at an outer periphery thereof, such that the second oxide film is formed on the outer periphery of the signal wire.