US 12,474,199 B2
Load detection mechanism and pin-type load cell
Takuma Okamoto, Cupertino, CA (US); Kazuhiro Nishikawa, Chuo (JP); and Takayuki Kasai, Chuo (JP)
Assigned to NAMESBEA MITSUMI Inc. ASSIGNEE, Nagano (JP); and KITO CORPORATION, Yamanashi (JP)
Appl. No. 17/754,969
Filed by MINEBEA MITSUMI Inc., Nagano (JP); and KITO CORPORATION, Yamanashi (JP)
PCT Filed Sep. 3, 2020, PCT No. PCT/JP2020/033362
§ 371(c)(1), (2) Date Sep. 16, 2022,
PCT Pub. No. WO2021/079630, PCT Pub. Date Apr. 29, 2021.
Claims priority of application No. 2019-192089 (JP), filed on Oct. 21, 2019.
Prior Publication US 2023/0213372 A1, Jul. 6, 2023
Int. Cl. G01G 19/18 (2006.01); G01L 1/22 (2006.01)
CPC G01G 19/18 (2013.01) [G01L 1/22 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A load detection mechanism for detecting a load of an object, the load detection mechanism comprising:
a first member configured to be connected to a fixed structure;
a second member configured to suspend the object;
a pin configured to cause the second member to be suspended from the first member by continuously penetrating the first member and the second member;
a plurality of strain gauges attached to the pin; and
a circuit substrate disposed on the second member, wherein:
a connection circuit forming a bridge circuit by connecting the plurality of strain gauges and an amplification circuit configured to amplify output from the bridge circuit are formed on the circuit substrate;
the pin includes a first pin and a second pin;
the plurality of strain gauges includes a plurality of first strain gauges attached to the first pin and a plurality of second strain gauges attached to the second pin; and
the bridge circuit includes a first bridge circuit in which the plurality of first strain gauges is connected and a second bridge circuit in which the plurality of second strain gauges is connected.