In a message dated 97-05-31 00:47:02 EDT, you write: >Sometime ago, a PCB manufacturer gave a presentation and talked about "ED" > technology while unfortunately I was not present. People in the > presentation are still not clear what ED is and asked for my help. I am not > > a PCB expert either. I tried to find something on the net w/o luck. > > Is ED a new resist technology? What are the conventional technologies? > Could someone on the net offer some insights or some references? > Yuan Li: I suspect strongly that the presenter was referring to Electrophoretic Deposition, a relatively new technology in application of photoresist. Most PCB manufacturers use "dryfilm" photoresist, where the photoresist is supplied as a film, wrapped up on a roll. In ED, the photoresist is literally electroplated directly from a solution, on to the Copper foil, in theory, giving a very uniform coating, that is very thin, thus allowing very fine line/space, at least as compared to dryfilm photoresist. This technology is not very common, and there have been many attempts at making it successful, which have failed. The technology sounds extremely promising, but it will take some very sound engineering to make it successful. I hope this is insightful. Rudy Sedlak RD Chemical Company *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************