Method for producing a marking device and apparatus for carrying out said method

A method of producing a marking device in which, upon the surface of a carrier (29) a coding coating with at least one magnetic base layer (30) and at least one magnetic coding layer (37) as well as an intermediate layer (35) disposed therebetween, is applied, which has such a characteristic that it provides regions of nonparallel or antiparallel coupling, characterized in that in the application of the intermediate layer (35) at least one mask (32) is used for covering the regions at which no intermediate layer formation is to be effected.

A method of making a marking device in which a coding coating with at least one magnetic base layer (63) and at least one magnetic coding layer (65) as well as a nonmagnetic intermediate layer (64) between them is applied to the surface of a carrier (62) and which has such a characteristic that it has regions of nonparallel or antiparallel coupling, characterized in that the intermediate layer (64) is initially applied over the entire area and then at least a part of the intermediate layer (64) is regionally removed.

A method of producing a marking device in which on a surface of a carrier, a coding coating has at least one magnetic base layer and at least one magnetic coding layer as well as a nonmagnetic intermediate layer between them, is provided and which has such a characteristic that regions of nonparallel or antiparallel coupling are provided, characterized in that the intermediate layer is galvanically applied and the application is controlled with respect to place and thickness by a nonhomogeneous electric field.

The method of producing a marking device in which, on the surface of a carrier, a coding coating is applied with at least one magnetic base layer, at least one magnetic coding layer and a nonmagnetic intermediate layer between them, and which has a characteristic such that regions of nonparallel or antiparallel coupling are produced, characterized in that the coding coating after it is produced is locally heated to such a temperature that there the magnetic coupling is altered.

The method of making a marking device in which a coding coating is provided on the surface of a carrier and has at least one magnetic base layer, at least one magnetic coding layer and a nonmagnetic intermediate layer arranged between the two and which has such characteristics that regions of nonparallel or antiparallel coupling are produced, characterized in that the coding coating after its production is locally subjected to ion bombardment and that there the magnetic coupling is altered.