US 12,442,665 B2
Hall sensor—magnet geometry for large stroke linear position sensing
Yiftah Kowal, Tel Aviv (IL); Nadav Goulinski, Tel Aviv (IL); Tal Korman, Tel Aviv (IL); and Ephraim Goldenberg, Tel Aviv (IL)
Assigned to Corephotonics Ltd., Tel Aviv (IL)
Filed by Corephotonics Ltd., Tel Aviv (IL)
Filed on Feb. 6, 2025, as Appl. No. 19/046,550.
Application 19/046,550 is a continuation of application No. 18/591,012, filed on Feb. 29, 2024, granted, now 12,247,851.
Application 18/591,012 is a continuation of application No. 17/628,905, granted, now 11,946,775, issued on Apr. 2, 2024, previously published as PCT/IB2021/056693, filed on Jul. 26, 2021.
Claims priority of provisional application 63/059,200, filed on Jul. 31, 2020.
Prior Publication US 2025/0180378 A1, Jun. 5, 2025
This patent is subject to a terminal disclaimer.
Int. Cl. G01D 5/14 (2006.01)
CPC G01D 5/145 (2013.01) 20 Claims
OG exemplary drawing
 
1. A position sensing unit, comprising:
a magnetic assembly (MA) having a width W measured along a first direction and a height H measured along a second direction and including at least three magnets having respective magnetic polarizations that define along the first direction at least a left MA domain, a middle MA domain and a right MA domain, wherein the magnetic polarizations of each MA domain are different; and
a magnetic flux measuring device (MFMD) for measuring a magnetic flux B,
wherein the MA is configured to move relative to the MFMD along the first direction within a stroke L that fulfils 1 mm≤L≤5 mm, and wherein a minimum value Dmin of an orthogonal distance D measured along the second direction between a particular MA domain and the MFMD of the position sensing unit, fulfills L/Dmin>5,
wherein the at least three magnets are positioned sequentially along the first direction, and wherein adjacent magnets are separated by a gap;
wherein the magnetic polarization of the left MA domain is directed opposite than the magnetic polarization of the right MA domain, and the magnetic polarization of the middle MA domain is directed parallel or anti-parallel to the first direction.