US 12,435,967 B2
Magnetism detection device and absolute encoder
Yasuo Osada, Nagano (JP)
Assigned to MINEBEA MITSUMI Inc., Nagano (JP)
Appl. No. 18/547,747
Filed by MINEBEA MITSUMI Inc., Nagano (JP)
PCT Filed Feb. 24, 2022, PCT No. PCT/JP2022/007640
§ 371(c)(1), (2) Date Aug. 24, 2023,
PCT Pub. No. WO2022/181700, PCT Pub. Date Sep. 1, 2022.
Claims priority of application No. 2021-031228 (JP), filed on Feb. 26, 2021.
Prior Publication US 2024/0133671 A1, Apr. 25, 2024
Prior Publication US 2024/0230310 A9, Jul. 11, 2024
Int. Cl. G01B 7/30 (2006.01); G01D 5/14 (2006.01)
CPC G01B 7/30 (2013.01) [G01D 5/14 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A magnetism detection device, comprising:
a magnet magnetized;
a magnetic sensor configured to detect a magnetic flux from the magnet;
a magnet holder holding the magnet;
a shaft;
a case including a plurality of sidewall portions and an upper surface portion and configured to accommodate the magnet and the magnetic sensor inside; and
a shielding member having a flat plate shape and a shape corresponding to the upper surface portion and attached to the upper surface portion,
wherein the shielding member includes a protruding portion protruding outward from an outer peripheral portion,
the case includes a recessed portion opening inward at an end portion outside of the upper surface portion and configured to accommodate the protruding portion, and
the recessed portion includes a plurality of sidewall portions having different widths and a plurality of upper wall portions having different heights.