公开(公告)号：US10557724B1

公开(公告)日：2020-02-11

申请号：US16145941

申请日：2018-09-28

Applicant: Apple Inc.

Inventor： Manoj K. Bhattacharyya ,  Daniel Ray Bloom ,  Rajesh Anantharaman

IPC: G01D5/14 ,  G06F3/01 ,  G01R33/038 ,  G01R33/09

Abstract: An angular detection system including a magnet and sensors is disclosed. The magnet can be located on a rotating component and the sensors can be located on a stationary component, or vice versa. The magnet can generate a plurality of magnetic flux lines. The plurality of sensors can be located and spatially separated along the motion path of the magnet for detecting the magnetic flux densities. The strength of the magnetic flux lines sensed by a given sensor can be used to determine the location of the magnet along its motion path. The plurality of sensors can generate one or more signals indicative of the strength of the sensed magnetic field lines. Based on the strength of the magnetic flux lines, the location of the magnet, or both, the system can determine the angle of rotation of the device by using a polynomial function or a look-up table.