Patent ID: 9733105
Date: 2017-08-15
CPC Classifications: G01D

Claim:
1. A magnetic field measuring device comprising: a semiconductor body with a surface parallel to an x-y plane, an x direction and a y direction being orthogonal to one another; a magnet with a flat main extension surface parallel to the x-y plane, a direction of magnetization changing along the main extension surface due to at least two adjacent magnetic poles, the magnet being rotatable relative to the semiconductor body about an axis of rotation extending in a z direction, the z direction being orthogonal to the x-y plane, wherein an imaginary extension of the axis of rotation passes through the main extension surface of the magnet at a centroid of the magnet, wherein the surface of the semiconductor body is spaced apart from the main extension surface of the magnet in the z direction, wherein the semiconductor body has three magnetic field sensors spaced apart from one another on the surface, each of the magnetic field sensors measuring a same direction of a same component of the magnetic field, a first magnetic field sensor and a third magnetic field sensor each having substantially the same spacing from a second magnetic field sensor, the three magnetic field sensors disposed along a first direction in the x-y plane, wherein, for a projection of the main extension surface along the imaginary extension of the axis of rotation or along the axis of rotation, all magnetic field sensors are located within the projected area, wherein the magnetic field sensors have a spacing from the imaginary extension of the axis of rotation or from the axis of rotation, and wherein the first magnetic field sensor and the third magnetic field sensor each have substantially the same spacing from the imaginary extension of the axis of rotation or from the axis of rotation.