US 12,467,809 B2
Detector and detecting system
Shinji Murata, Miyagi (JP); and Kimihiro Yokoyama, Tokyo (JP)
Assigned to Alps Alpine Co., Ltd., (JP)
Filed by Alps Alpine Co., Ltd., Tokyo (JP)
Filed on Aug. 25, 2022, as Appl. No. 17/895,675.
Application 17/895,675 is a continuation of application No. PCT/JP2021/010929, filed on Mar. 17, 2021.
Claims priority of application No. 2020-049851 (JP), filed on Mar. 19, 2020; and application No. 2020-058466 (JP), filed on Mar. 27, 2020.
Prior Publication US 2022/0404222 A1, Dec. 22, 2022
Int. Cl. G01L 5/24 (2006.01); G01L 1/22 (2006.01); G01L 5/1627 (2020.01)
CPC G01L 5/24 (2013.01) [G01L 1/2287 (2013.01); G01L 5/1627 (2020.01)] 7 Claims
OG exemplary drawing
 
1. A detector that detects fastening axial force applied by a fastening unit in an axial direction, the detector comprising:
a strain element that has a through hole through which a bolt portion that the fastening unit has is inserted, the strain element having a planar portion at a side thereof, the planar portion extending along the axial direction and a first direction perpendicular to the axial direction, the planar portion having a center line extending along the first direction;
a strain sensing sensor that senses strain of the strain element, the strain sensing sensor being disposed on the planar portion of the strain element; and
an antenna disposed on the planar portion of the strain element to overlap and align with the strain sensing sensor along a second direction perpendicular to each of the axial direction and the first direction,
wherein the strain sensing sensor is configured with first, second, third, and fourth strain detecting elements,
the first and second strain detecting elements are aligned along a first linear line parallel to the first direction, and each of the first and second strain detecting elements is located closer to a bottom of the strain element than each of the third and fourth strain detecting elements and the center line of the planar portion,
the third and fourth strain detecting elements are aligned along a second linear line parallel to the axial direction, and
the third and fourth strain detecting elements are arranged so as to sandwich the center line of the planar portion along the second linear line.