US 11,898,884 B2
Stroke sensor and brake system and steering system for vehicle using the same
Takahiro Moriya, Tokyo (JP); Toshihiko Oyama, Tokyo (JP); Keiji Suzuki, Tokyo (JP); and Toshio Ishikawara, Tokyo (JP)
Assigned to TDK Corporation, Tokyo (JP)
Filed by TDK Corporation, Tokyo (JP)
Filed on Jul. 28, 2022, as Appl. No. 17/875,617.
Claims priority of application No. 2021-143883 (JP), filed on Sep. 3, 2021.
Prior Publication US 2023/0077951 A1, Mar. 16, 2023
Int. Cl. G01D 5/14 (2006.01); B62D 15/02 (2006.01); B60T 17/22 (2006.01)
CPC G01D 5/14 (2013.01) [B60T 17/22 (2013.01); B60T 2220/04 (2013.01); B62D 15/0225 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A stroke sensor comprising:
a first magnet;
a second magnet, wherein a distance between the first magnet and the second magnet in a first direction is fixed; 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 position in the first direction at which magnetic field intensity in the second direction is zero is positioned between a reference axis and the second magnet, 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.