Method for making inscriptions on keys for typing of office machines, made of plastic which changes colour under action of a laser beam

摘要

A known method for labeling parts made of a plastic, which can be discolored by the action of energy radiation, is to be used to provide the key buttons of a keyboard with alpha / numeric characters or other symbols. For this purpose, the office machine keyboard, which is completely equipped with unlabelled button buttons, is relative to the energy radiation, e.g. a laser beam, wherein the assigned character or symbol is recorded on each key button by the energy radiation in accordance with stored data when the key button comes into the area of influence of the energy radiation.