Input device using magnetic field for input detection

摘要

Described are examples of an input device having a wheel with a plurality of teeth, where at least the plurality of teeth are composed of a ferrous or magnetic material. A magnet is disposed to provide a first magnetic field that attracts the ferrous or magnetic material of the plurality of teeth to provide a detent action when moving the wheel from a first position to a second position. A magnet sheet is disposed to provide a second magnetic field that causes the magnet sheet to deform based on magnetic attraction to the ferrous or magnetic material of the plurality of teeth when moving the wheel from the first position to the second position. A strain sensor coupled to the magnet sheet can detect a strain caused by deformation of the magnet sheet, and provide an electronic signal indicating the strain.