Improved Technique for Laser Scribing Printed Circuit Boards
Original Publication Date: 1989-Nov-01
Included in the Prior Art Database: 2005-Jan-29
In the production of printed circuit boards, one conventional process for forming the circuitry is to first plate or otherwise deposit a thin coating of copper or other metal on the surface of the board and then laser scribe the desired circuit pattern in the metal on the board. This is typically done with a CO2 laser. One of the problems encountered with such laser scribing is that edges of the conductive lands formed are jagged and rough, not the more desirable smooth straight type of line definition which is desired. Another problem encountered in the laser scribing is the deposit of a byproduct of the laser scribing process known as "Char" over the board and especially at the interface between the scribed lands and the exposed substrate.