Integrated X-Ray Pattern
Original Publication Date: 1987-Aug-01
Included in the Prior Art Database: 2005-Feb-01
Multilayered printed circuit boards must be tested after assembly to ensure that the layers are positioned correctly in relationship to each other. Diagnostic X-rays and the location of X-ray targets are used to determine if the layers are properly positioned. These X-ray targets can interfere with signal plane wiring, and design blockages are used to route wires around the targets. This method uses valuable wiring channels and decreases wirability. A method of integrating the X-ray pattern into the wiring areas of the board where they can directly measure the dimensional stability and merge data for reliability and quality is described in the following. The X-ray targets are placed in any open area between modules or an input/output and do not require any blockage.