公开(公告)号：US20170301439A1

公开(公告)日：2017-10-19

申请号：US15516025

申请日：2015-07-22

Applicant: KOA Corporation

Inventor： Naoto OKA ,  Homare SASAKI

IPC: H01C17/242 ,  H01C17/00 ,  B23K26/351

CPC classification number: H01C17/242 ,  B23K26/351 ,  H01C17/006

Abstract: The invention is to provide a resistor trimming method capable of adjusting a resistance value with ultrahigh precision and having excellent production efficiency. To achieve the object, a start point (S1) at a distance from a resistor (4) is irradiated with laser light while probes are brought into contact with a pair of surface electrodes (3) to measure a resistance value of the resistor (4). The place irradiated with the laser light is scanned so that a first trimming groove (5) extending in a direction perpendicular to a current direction can be formed in the resistor (4). Then, the place irradiated with the laser light is returned by a predetermined amount from an end point (first turning point (T1)) of the first trimming groove (5) to be set as a second turning point (T2). With the second turning point (T2) as a start point, scanning and cutting is performed to forma second trimming groove (6). Thus, the resistance value of the resistor (4) is adjusted to a target resistance value with high precision.

公开(公告)号：US20220319745A1

公开(公告)日：2022-10-06

申请号：US17703798

申请日：2022-03-24

Applicant: KOA CORPORATION

Inventor： Homare SASAKI ,  Yasuhiro KAMIJO

IPC: H01C7/00 ,  H01C1/14 ,  H01C17/22 ,  H01C17/00

Abstract: A chip resistor includes an insulated substrate having a rectangular parallelepiped shape, a first front electrode and a second front electrode created on both longitudinal ends of the insulated substrate, and a resistive element making a connection between the first and second front electrodes. The resistive element is formed in a meandering shape with a first region and a second region continuing in series via a jointing section between a pair of connecting portions. Moreover, in the first region, a first trimming groove for rough adjustment is formed to elongate a current path of the resistive element. In the second region, a second trimming groove is formed for fine adjustment extending in a direction angled with respect to a straight line along a direction in which the first trimming groove extends.