Sätt att bilda en streckkod

摘要

The present invention relates to a method of providing a printed circuit board with a barcode by allowing the solder mask to form the dark lines of the barcode, and to form the highly luminous lines of the barcode from bright metal surfaces. In this regard there is required a special detection method which will permit the light rays to be reflected directly from the bright surface parts onto a projection surface that has a dull structure, and to provide a detector unit in which the image of the barcode projected onto the projection surface is detected.