US 11,988,730 B2
Device, system and method for obtaining a magnetic measurement with permanent magnets
Uri Rapoport, Moshav Ben Shemen (IL); Yair Goldfarb, Ness Ziona (IL); and Yoram Cohen, Yarkona (IL)
Assigned to Aspect Imaging Ltd., Shoham (IL)
Filed by Aspect Imaging Ltd., Shoham (IL)
Filed on Mar. 29, 2022, as Appl. No. 17/707,375.
Application 17/707,375 is a continuation of application No. 16/324,218, granted, now 11,287,497, issued on Mar. 29, 2022, previously published as PCT/IL2017/050371, filed on Mar. 26, 2017.
Application 16/324,218 is a continuation in part of application No. 15/402,438, filed on Jan. 10, 2017, granted, now 10,224,135, issued on Mar. 5, 2019.
Claims priority of provisional application 62/381,079, filed on Aug. 30, 2016.
Claims priority of provisional application 62/372,065, filed on Aug. 8, 2016.
Prior Publication US 2022/0291312 A1, Sep. 15, 2022
Int. Cl. H01F 7/02 (2006.01); G01R 33/383 (2006.01); G01R 33/3873 (2006.01); G01R 33/421 (2006.01); G01R 33/565 (2006.01)
CPC G01R 33/383 (2013.01) [G01R 33/3873 (2013.01); G01R 33/421 (2013.01); G01R 33/56563 (2013.01); H01F 7/0273 (2013.01); H01F 7/0278 (2013.01)] 30 Claims
OG exemplary drawing
 
1. A magnetic field device, comprising:
a first magnet;
a first ferromagnetic element positioned adjacent to the first magnet;
a second magnet;
a second ferromagnetic element positioned adjacent to the second magnet and relative to the first ferromagnetic element to create a gap between the first ferromagnetic element and the second ferromagnetic element; and
a third magnet positioned at least partially between the first ferromagnetic element and the second ferromagnetic element and at least partially within the gap; and
a fourth magnet positioned around the first magnet,
wherein:
a first axis of the magnetic field device is defined as passing through the first magnet, the first ferromagnetic element, the second ferromagnetic element and the second magnet, and a second axis of the magnetic field device is perpendicular to the first axis,
each of the first, second and third magnets have a magnetization direction that is parallel to the first axis, the first magnet and the second magnet have the same magnetization direction, and the third magnet has a magnetization direction that is opposite the magnetization direction of the first and second magnets, and
the fourth magnet has a magnetization direction that is parallel to the second axis.