US 11,867,717 B2
Rotation speed sensor
Kazuhiko Tomita, Tokyo (JP); Kento Okuyama, Tokyo (JP); and Kei Kawano, Tokyo (JP)
Assigned to PROTERIAL, LTD., Tokyo (JP)
Filed by Proterial, Ltd., Tokyo (JP)
Filed on Sep. 3, 2020, as Appl. No. 17/011,309.
Claims priority of application No. 2019-167206 (JP), filed on Sep. 13, 2019.
Prior Publication US 2021/0080480 A1, Mar. 18, 2021
Int. Cl. G01P 3/487 (2006.01); G01D 5/12 (2006.01)
CPC G01P 3/487 (2013.01) [G01D 5/12 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A rotation speed sensor comprising:
a sensor component having a first surface, a second surface on an opposite side of the first surface, a first magnetic sensing element arranged between the first surface and the second surface, and a second magnetic sensing element arranged between the first surface and the second surface so as to separate from the first magnetic sensing element;
a magnet arranged in a region closer to the second surface of the sensor component than the first surface of the sensor component; and
a magnetic plate arranged between the second surface of the sensor component and the magnet and made of a magnetic material different from the magnet,
wherein the magnetic plate includes an opening formed in a first direction that is a direction in which the sensor component, the magnetic plate and the magnet are arranged,
the opening is a through hole that penetrates the magnetic plate in the first direction,
one end of the opening faces the sensor component, and
the other end of the opening faces the magnet.