INFORMATION SIGNAL GENERATION APPARATUS

摘要

An information signal generating apparatus including a planar magnetic field shielding element which is provided with apertures representing coded information and through which a magnetic flux from a magnetic field source disposed on one side of the planar element is adapted to pass. A signal generator which may be in the form of a pair of facing pole pieces disposed on opposite sides of the planar element is adapted to move across the planar element and is provided with an inductively coupled winding. A current is induced in the winding when the pole pieces cut lines of force passing through the apertures thereby to produce electrical signals.