Chip resistor and chip resistor production method

Patent metadata

Field	Value
Publication number	US-11170918-B2
Application number	US-201917049486-A
Country	US
Kind code	B2
Filing date	Apr 8, 2019
Priority date	May 17, 2018
Publication date	Nov 9, 2021
Grant date	Nov 9, 2021

Abstract

A chip resistor is capable of improving surge characteristic while finely adjusting a resistance value with high accuracy. A chip resistor includes a resistor which is print-formed such that a first meandering portion is consecutively connected to a second meandering portion across a rectangular adjustment portion. The adjustment portion is provided with a first trimming groove to lengthen a current path of the resistor, thereby improving the surge characteristic while coarsely adjusting a resistance value of the resistor to bring it close to a target resistance value. Furthermore, a second trimming groove is provided in an area of the second meandering portion where a current distribution is small, thereby finely adjusting the resistance value of the resistor to make it coincide with the target resistance value in accordance with a cutting amount of the second trimming groove.

First claim

The invention claimed is:

1. A chip resistor comprising:
an insulating substrate;
a pair of electrodes which are oppositely disposed on the insulating substrate with a predetermined interval therebetween; and
a resistor which bridges between the pair of electrodes,
the resistor being provided with trimming grooves so as to adjust a resistance value,
wherein
the resistor comprises a print-forming body that consecutively connects the pair of electrodes, whereas the print-forming body having connecting portions each connected to the pair of electrodes and a rectangular shaped adjustment portion, whereas the adjustment portion is located between the connecting portions,
at least one of the connecting portions is a turn-shaped meandering portion,
a first trimming groove for coarse adjustment is provided in the adjustment portion to lengthen a current path of the resistor and a second trimming groove for fine adjustment is provided in the meandering portion,
when referring to a direction between the pair of electrodes as an X direction and referring to a direction perpendicular to the X direction as a Y direction, the meandering portion includes an extending portion extending in the Y direction, an outer turn portion extending in the X direction to connect between one end of the extending portion and one of the pair of electrodes, and an inner turn portion extending in the X direction to connect between the other end of the extending portion and the adjustment portion,
the second trimming groove extends in the Y direction from one of the outer turn portion and the inner turn portion as a starting end position, and
a distal end of the second trimming groove does not reach an imaginary line connecting the outer turn portion and the inner turn portion at a shortest distance.

2. The chip resistor according to claim 1 , wherein
both of the connecting portions are turn-shaped meandering portions, and
the second trimming groove is provided in one of the meandering portions.

3. A manufacturing method of a chip resistor,
the chip resistor including an insulating substrate, a pair of electrodes which are oppositely disposed on the insulating substrate with a predetermined interval therebetween; and a resistor which bridges between the pair of electrodes,
the resistor being provided with trimming grooves so as to adjust a resistance value,
wherein
the resistor comprises a print-forming body that consecutively connects the pair of electrodes, whereas the print-forming body having connecting portions each connected to the pair of electrodes and a rectangular shaped adjustment portion, whereas the adjustment portion is located between the connecting portions,
at least one of the connecting portions is a turn-shaped meandering portion, and
when referring to a direction between the pair of electrodes as an X direction and referring to a direction perpendicular to the X direction as a Y direction, the meandering portion includes an extending portion extending in the Y direction, an outer turn portion extending in the X direction to connect between one end of the extending portion and one of the pair of electrodes, and an inner turn portion extending in the X direction to connect between the other end of the extending portion and the adjustment portion,
the manufacturing method comprising the steps of:
forming a first trimming groove for coarse adjustment in the adjustment portion to lengthen a current path of the resistor;
forming a second trimming groove for fine adjustment which extends in the Y direction from one of the outer turn portion and the inner turn portion as a starting end position, and
setting a distal end of the second trimming groove to a position which does not reach an imaginary line connecting the outer turn portion and the inner turn portion at a shortest distance.

Assignees

• Koa Corp

Inventors

• Ushiyama Kazuhisa
• Iguchi Natsuki
• Kamijo Yasuhiro
• Nagata Hisakazu

Classifications

• H01C17/006 Primary

  adapted for manufacturing resistor chips · CPC title

• H01C7/22 Primary

  Elongated resistive element being bent or curved, e.g. sinusoidal, helical · CPC title

• H01C17/242

  by laser · CPC title

• H01C17/065

  by thick film techniques, e.g. serigraphy · CPC title