US 12,487,103 B2
Position detection device
Yohei Shirakawa, Tokyo (JP); Yuta Sugiyama, Tokyo (JP); Yoshiaki Yanagisawa, Tokyo (JP); Yoshitake Ageishi, Tokyo (JP); and Yukio Ikeda, Tokyo (JP)
Assigned to Proterial, Ltd., Tokyo (JP)
Filed by Proterial, Ltd., Tokyo (JP)
Filed on Oct. 20, 2023, as Appl. No. 18/491,352.
Claims priority of application No. 2022-171655 (JP), filed on Oct. 26, 2022.
Prior Publication US 2024/0142277 A1, May 2, 2024
Int. Cl. G01D 5/20 (2006.01)
CPC G01D 5/204 (2013.01) 7 Claims
OG exemplary drawing
 
1. A position detection device configured to detect a position of a moving member moving backward and forward in a predetermined moving direction, comprising:
an exciting coil disposed along the moving member extending in the moving direction;
a detection coil that outputs a voltage corresponding to a position of a detection target portion moving with the moving member by means of a magnetic field generated by the exciting coil within a predetermined detection range in the moving direction; and
a calculation unit that calculates the position of the moving member by the output voltage of the detection coil,
wherein the detection coil includes a pair of coil elements whose output voltage changes according to the position of the moving member, and phases of the output voltages of the pair of coil elements during movement of the moving member within the detection range differ from each other, and
wherein at least any coil element of the pair of coil elements includes a main coil portion that generates a voltage according to the position of the detection target portion by a magnetic field generated by the exciting coil when the position of the detection target portion is within the detection range, and a sub coil portion that generates a voltage by the magnetic field generated by the exciting coil when the position of the detection target portion is outside the detection range.