Patent ID: 9583256
Date: 2017-02-28
CPC Classifications: H01F

Claim:
1. A wearable device, comprising: a housing, wherein the housing includes (i) a first outer surface, (ii) a second outer surface opposite the first outer surface, the second outer surface being narrower than the first outer surface and being configured to contact skin at an external body surface, and (iii) a chamfer of a given shape between the first outer surface and the second outer surface; magnetic shielding disposed in the housing between the first outer surface and the second outer surface; and a coil disposed in the housing and configured to generate a magnetic field, wherein the coil includes coil windings that substantially fit the given shape of the chamfer, and wherein the coil windings include a first portion of coil windings proximate to the magnetic shielding and further include a second portion of coil windings narrower than the first portion of coil windings and proximate to the second outer surface.