Marking device, method and apparatus for the production thereof and a method for reading a marking device of this type

摘要

The invention relates to a marking device (21) for the identification of objects, comprising a coding consisting of areas (24, 25) of differing magnetic properties. The marking device is characterised in that it has magnetic areas (24, 25) consisting of a homogeneous, ferromagnetic or ferrimagnetic material, each of said areas having a magnetic anisotropy with an easy and hard magnetic axis, whereby areas with a different orientation of the easy magnetic axis and/or areas with remanence of different strengths succeed each other in at least one specific direction. The invention also relates to a method for producing a marking device of this type and to apparatus for carrying out the method.