High Contrast Laser Marking
Original Publication Date: 1988-Aug-01
Included in the Prior Art Database: 2005-Feb-15
High contrast marking or coding of manufactured parts can be achieved through laser scribing of thin metal films. A multilayer thin film plate can be provided to the surface of the article to be marked by any workable bonding technique. The bonding process is not unique and may be tailored to the users' needs, for example, physically tacking the plate to the article, mechanically adhering with a bonding agent or chemically bonding the plate to the article's surface. The multilevel metal plate should comprise at least three layers: a bottom layer to adhere to the article's surface, an intermediate layer of an oxidizable metal, and a top layer which is laser-etchable and which provides a tonal contrast to the oxide of the intermediate metal layer.