Systems Approach for Permanent Readable Identification Marking on Subtractively Processed Printed Circuit Panels
Original Publication Date: 1988-May-01
Included in the Prior Art Database: 2005-Feb-15
A method of providing machine-readable serial numbers for the automation of data collection and material handling allowing traceability from raw materials to a finished printed circuit board (PCB) is accomplished using a subtractive circuitization process. The process is described in the following. At signal core and composite lamination layup an ink jet marking process is used to label the PCB. As seen in Fig. 1, the next to last pre-preg sheet to be installed is marked with readable characters on the edge along the pre-preg border by the ink jet printer. An additional sheet of pre-preg is then applied and a sheet of copper is placed on top of the marked pre-preg sheet.