Unsichtbare Laserbeschriftung als Sicherheitsmerkmal für Kunststoffkarten

摘要

The invention relates to a laser labeling for use as a security feature for plastic cards with an overlay layer and at least one core layer or marking layer disposed below in which the security feature is inscribed. The aim of the invention is to improve the protection of such cards against forgery. To this end, the security feature is invisible to the naked eye, it is inscribed with a laser in the NIR range and it is read out with a detector that is effective in the NIR range. Alternatively, it is inscribed with a laser in the UV range and it is read out with a detector that is effective in the UV range.