US 11,940,401 B2
Sulfurization detection resistor and manufacturing method therefor
Junichi Otsuka, Ina (JP); and Yoji Kobayashi, Ina (JP)
Assigned to KOA CORPORATION, Nagano (JP)
Appl. No. 17/418,000
Filed by KOA CORPORATION, Ina (JP)
PCT Filed Dec. 24, 2019, PCT No. PCT/JP2019/050690
§ 371(c)(1), (2) Date Jun. 24, 2021,
PCT Pub. No. WO2020/153084, PCT Pub. Date Jul. 30, 2020.
Claims priority of application No. 2019-010575 (JP), filed on Jan. 24, 2019.
Prior Publication US 2022/0091058 A1, Mar. 24, 2022
Int. Cl. G01R 27/08 (2006.01); G01N 27/04 (2006.01); H01C 17/22 (2006.01); H01C 17/28 (2006.01); H01C 7/00 (2006.01)
CPC G01N 27/041 (2013.01) [H01C 17/22 (2013.01); H01C 17/28 (2013.01); H01C 7/00 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A sulfurization detection resistor comprising an insulated substrate having a rectangular parallelepiped shape, a pair of front electrodes formed at both ends on a main surface of the insulated substrate, resistive elements and sulfurization detecting conductors, each resistive element and each sulfurization detecting conductor being formed in series between the pair of front electrodes, and a protective film formed to entirely cover the resistive elements and partially cover the sulfurization detecting conductors,
wherein the multiple sulfurization detecting conductors are connected in parallel to the front electrodes and have their sulfurization detecting portions that are exposed out of the protective film;
the multiple sulfurization detecting conductors respectively have material compositions having principally Ag but with different contents of Pd; and
different timings are set for the multiple sulfurization detecting portions respectively to become disconnected depending on a cumulative amount of sulfurization.