Gao Gesellschaft Fur Automation Und Organisation Mbh

Wolfgang Becker

Joseph S Lass

Erwin Lob

Hansjurgen Merkle

Werner Herget

Wittich Kaule

Alexander Hierweger

Hajo Muck

Information is provided in a multilayer identification card by means of a laser beam. This information is recorded by irreversibly changing (blackening) transparent synthetic material. Synthetic materials which blacked at different intensity values are used for the individual card layers. By controlling the laser beam intensity, information can thus be recorded only in one layer or else simultaneously in several layers. If the layer arrangement, layer materials and recording parameters (intensity, writing width, etc.) are selected appropriately, images can be produced which change their appearance when the viewing angle is changed. The various visual effects which can thereby be obtained serve to distinguish the authenticity of the identification card.

Identification card with a visible authenticity feature

The present invention relates to a data carrier (identification card, bank card, credit card, etc.) in which information is provided in an inner volume area by means of a laser beam, the information being visible in the form of changes in the optical properties of the carrier material due to an irreversible change in the material caused by the laser beam and to a method for producing the data carrier and for testing it.

Data carrier having an optical authenticity feature and methods for

Information is provided in a multilayer identification card by means of a laser beam. This information is recorded by irreversibly changing (blackening) transparent synthetic material. Synthetic materials which blacken at different intensity values are used for the individual card layers. By controlling the laser beam intensity, information can thus be recorded only in one layer or else simultaneously in several layers. If the layer arrangement, layer materials and recording parameters (intensity, writing width, etc.) are selected appropriately, images can be produced which change their appearance when the viewing angle is changed. The various visual effects which can thereby be otained serve to distinguish the authenticity of the identification card.

Identification card with a visible authenticity feature and a method of

A method of testing a security having a mechanically testable identifying mark, for example a security thread, which has a physical property, for example electric conductivity, which can be measured without contact by means of a first field, for example, an electric field. The physical property can be reproducibly influenced by the effect of a second field, for example an electromagnetic field. If this influence takes place periodically, a signal is produced as a measured variable modulated according to the mutual effect of the two fields.

Method of testing a security and a security for carrying out this method

The record carrier has a card base, on which there are deposited an electrically highly conductive layer and an electrically highly insulating layer with the interposition therebetween of a chemically homogeneous intermediate layer into which safety features or information can be introduced by varying the conductivity of selected areas of the intermediate layer to provide areas of different respective electrical conductivities. In the method, the safety features or information are mechanically checked or read by applying a short voltage pulse between the conductive layer and an auxiliary electrode in contact with the insulating layer, with the charge image produced on the insulating layer being then scanned and evaluated in a measuring instrument, after which evaluation the charge image is deleted. For mechanically checking the record carrier for intactness, as a safeguard against erasure, a longer voltage pulse is applied between the auxiliary electrode and the conductive layer, the longer voltage pulse having a length such that a uniform distribution of charge is obtained on the insulating layer, after which the charge image of the insulating layer is scanned by a measuring instrument, evaluated, and deleted after the evaluation. Either procedure may be used alone or both may be used successively.

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Neubiberg, Germany

Wolfgang Becker