US 12,422,242 B2
Strain gauge
Toshiaki Asakawa, Nagano (JP); Masaki Kitazono, Tokyo (JP); and Eiji Misaizu, Nagano (JP)
Assigned to MINEBEA MITSUMI Inc., Nagano (JP)
Appl. No. 17/758,721
Filed by MINEBEA MITSUMI Inc., Nagano (JP)
PCT Filed Jan. 13, 2021, PCT No. PCT/JP2021/000862
§ 371(c)(1), (2) Date Jul. 13, 2022,
PCT Pub. No. WO2021/145342, PCT Pub. Date Jul. 22, 2021.
Claims priority of application No. 2020-004564 (JP), filed on Jan. 15, 2020.
Prior Publication US 2023/0030190 A1, Feb. 2, 2023
Int. Cl. G01B 7/16 (2006.01); G01L 1/22 (2006.01); H05K 1/02 (2006.01)
CPC G01B 7/20 (2013.01) [G01L 1/2287 (2013.01); H05K 1/028 (2013.01); H05K 2201/10151 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A strain gauge comprising:
a flexible substrate;
a resistor formed on one side of the substrate;
a pair of terminal parts electrically connected to both ends of the resistor; and
a plurality of resistance value tuning wires configured to tune a resistance value between the pair of terminal parts,
wherein a plan shape of the resistor is a spiral shape formed by two linear resistance wires about a halfway part of the two linear resistance wires, the two linear resistance wires being a predetermined space apart from each other and extending in a same direction from the halfway part,
wherein the resistance value tuning wires are arranged discretely so as to bridge between the two linear resistance wires, and
wherein, given a circle drawn in plan view about a center of gravity of a region where the resistor is formed, all the resistance value tuning wires are arranged in a region where an area of the circle is within 30% of an area of the region where the resistor is formed.