Patent ID: 11874245
Assignee: KOA CORPORATION
Field: Measurement (Instruments)
Classification: CPC G  C  H | IPC C  G

Claim 0:
1. A method of manufacturing a sulfidation detection sensor, comprising:
a conductor forming step of forming a sulfidation detection conductor on a main surface of a large-sized substrate;
a protective film forming step of forming a pair of first protective films on the sulfidation detection conductor, and forming a second protective film so as to cover the sulfidation detection conductor positioned between the pair of first protective films;
a primary dividing step of primarily dividing the large-sized substrate into strip-shaped substrates after the protective film forming step;
an end face electrode forming step of forming end face electrodes on divided faces of each of the strip-shaped substrates, respectively;
a secondary dividing step of secondarily dividing each of the strip-shaped substrates into a plurality of chip substrates after the end face electrode forming step; and
an external electrode forming step of forming external electrodes on outer sides of the pair of first protective films, respectively, by performing electrolytic plating with respect to each of the chip substrates,
second protective film removing step for removing the second protective film after the external electrode formation step,
the pair of first protective films comprises an insoluble material having the property of not being soluble in a solvent used in the second protective film removal step,
the second protective film is made of a soluble material having a property of being soluble in a solvent used in the second protective film removing step,
wherein surface height of the second protective film is set to be lower than surface height of the pair of first protective films.