Patent ID: 11898884
Assignee: TDK CORPORATION
Field: Transport (Mechanical engineering)
Classification: CPC B  G | IPC B  G

Claim 13:
14. A stroke sensor comprising:
a first magnet;
a second magnet, wherein a distance between the first magnet and the second magnet is fixed in a first direction; and
a first magnetic field detecting sensor that is arranged apart from the first and second magnets in a second direction perpendicular to the first direction, wherein the first magnetic field detecting sensor detects a synthesized magnetic field in the first direction and the second direction that is generated by the first and second magnets, wherein
the first and second magnets are movable relative to the first magnetic field detecting sensor in the first direction,
the first magnet has a first surface that faces the first magnetic field detecting sensor in the second direction, the second magnet has a second surface that faces the first magnetic field detecting sensor in the second direction, and the first surface and the second surface have different polarities, and
a magnetic field that is generated by the first and second magnets is asymmetric about a reference axis, wherein the reference axis is parallel to the second direction and passes through a middle point of a minimum section that includes the first and second magnets in the first direction,
further comprising a second magnetic field detecting sensor that detects intensity of the magnetic field in the second direction, wherein the magnetic field is formed by the first and second magnets, and
an initial position of the second magnetic field detecting sensor is positioned between the reference axis and the second magnet.