Patent ID: 11967443
Assignee: KOA CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A chip resistor comprising:
a rectangular parallelepiped insulating substrate;
a pair of electrodes provided at both ends of a main surface of the insulating substrate;
a resistor that connects between the pair of electrodes;
a first insulating protective film provided on the resistor;
a second insulating protective film provided on the first insulating protective film;
a conductive auxiliary film provided so as to be over a connecting portion between one of the pair of electrodes and the resistor at a position away from an end face of the insulating substrate;
a pair of end face electrodes extending at both end faces of the insulating substrate so as to be connected to the electrodes; and
a pair of external plating layers covering the end face electrodes, the electrodes, and the auxiliary film, wherein
the connecting portion of the resistor with one of the electrodes is an exposed portion that is not covered with the first insulating protective film,
the auxiliary film is formed of a material with sulfide-resistant properties more than that of the electrodes,
a portion of the auxiliary film is sandwiched between the first insulating protective film and the second insulating protective film, and
at least a portion of the other of the auxiliary film entirely covers the exposed portion in a state of the auxiliary film being in contact with the exposed portion.