公开(公告)号：US11874245B2

公开(公告)日：2024-01-16

申请号：US17604082

申请日：2020-02-12

Applicant: KOA CORPORATION

Inventor： Taro Kimura

IPC: C25D7/00 ,  G01N27/12 ,  C25D5/02

CPC classification number: G01N27/12 ,  C25D5/028 ,  C25D7/00

Abstract: After a sulfidation detection conductor (2) is formed on a front surface of a large-sized substrate (10A), a pair of first protective films (3) made of an insoluble material is formed, respectively, on predetermined positions of the sulfidation detection conductor (2), and a second protective film (7) made of a soluble material is formed so as to cover the sulfidation detection conductor (2) positioned between the pair of first protective films (3), and thereafter, end face electrodes (5) are formed, respectively, on divided faces of each strip-shaped substrate (10B) obtained by primarily dividing the large-sized substrate (10A). Then, after external electrodes (6) are formed by performing electrolytic plating with respect to each chip substrate (10C) obtained by secondarily dividing each strip-shaped substrate (10B), a sulfidation detection portion (2a) is exposed to the outside by removing the second protective film (7), whereby a sulfidation detection sensor (10) can be obtained.

公开(公告)号：US11821864B2

公开(公告)日：2023-11-21

申请号：US17617122

申请日：2020-05-21

Applicant: KOA CORPORATION

Inventor： Taro Kimura ,  Kentaro Matsumoto

IPC: G01N27/12 ,  G01N17/00

CPC classification number: G01N27/12 ,  G01N17/00

Abstract: A sulfurization detection sensor 10 comprises: a rectangular parallelepiped insulation substrate 1, a pair of front electrodes 2 provided at both ends of a front surface in the longitudinal direction of the insulation substrate 1, respectively, a sulfurization detection conductor 3 connected between the front electrodes 2, a pair of protective films 4 for covering a part of the sulfurization detection conductor 3 and that of the front electrodes 2, respectively, a pair of back electrodes 5 provided at both ends of a back surface in the longitudinal direction of the insulation substrate 1, respectively, a pair of end face electrodes 6 provided at both ends in the longitudinal direction of the insulation substrate 1, respectively, and external electrodes 7 provided on front surfaces of the end face electrodes 6, respectively. Specific regions 3b in which a current hardly flows are formed at both ends in the Y-direction of a sulfurization detection portion 3A.

公开(公告)号：US11967443B2

公开(公告)日：2024-04-23

申请号：US17959641

申请日：2022-10-04

Applicant: KOA CORPORATION

Inventor： Taro Kimura

IPC: H01C1/142 ,  H01C7/00

CPC classification number: H01C1/142 ,  H01C7/003

Abstract: A chip resistor includes: an insulating substrate; a pair of front electrodes; a resistor connecting between both the front electrodes; an undercoat layer provided on the resistor; an overcoat layer provided on the undercoat layer, an auxiliary film provided so as to be over a connecting portion between the front electrode and the resistor at a position away from an end face of the insulating substrate; a pair of end face electrodes; and a pair of external plating layers covering the end face electrodes, the front electrodes, and the auxiliary film, wherein the auxiliary film is formed of a resin material containing metal particles, and a portion of the auxiliary film is sandwiched between the undercoat layer and the overcoat layer.

公开(公告)号：US11506594B2

公开(公告)日：2022-11-22

申请号：US17112493

申请日：2020-12-04

Applicant: KOA CORPORATION

Inventor： Taro Kimura

IPC: G01N17/04 ,  G01N27/12 ,  H01C1/142 ,  H01C1/034 ,  H01C13/02 ,  G01N17/00

Abstract: A sulfurization detection resistor includes: a rectangle-shaped insulating substrate; pair of front electrodes formed at both ends facing each other on a surface of the insulating substrate; plurality of sulfurization detection conductors arranged in parallel between the paired front electrodes; plurality of resistors connected between the ends of each of the sulfurization detection conductors and the paired front electrodes; and sulfide gas impermeable protective film that covers all of the resistors and some of the sulfurization detection conductors, wherein each of the sulfurization detection conductors has a sulfurization detection unit exposed from a window hole in the protective film; and by covering the sulfurization detection units with different types of sulfurization rate adjustment layers formed of an acrylic resin, a silicon resin, and the like, timing of disconnection is set so as to vary in response to a cumulative amount of sulfurization in each of the sulfurization detection units.