Hi Gene > So my question is, to someone who may have tried/done this, is can a 1 > ounce layer of copper be burned away rapidly enough so as not to leave a > burned, conductive path where the copper was?
I tried this with two different Lasers sources: 120 W CW CO2 Laser at 10600 µm wavelength: Result: no way to 'burn' the copper. It was hardly possible to burn away a the play of photosensitive coating used in the normal 'wet' process. 200W q-switched Yb:Yag Laser at 1064 µm: Result: even the 25 kW max. pulse energy were not sufficient to burn away the copper properly. It is possible to cut through the coper layer by the precess is not controlled enough. The pulse energy would probably have to be at least 10 times higher to establish a decent process. But this laser removes the light sensitive coating quite well at low power settings. > I ask because I have 3 or 4 old dvd writers that no longer write a usable > disk, although the written area can be seen on the throwaway disk. Pack > rat that I am, I haven't binned them yet. No way to affect the coper layer with a diode from a DVD writer, but is should be possible to expose the light sensitive coating using a low power blue LED. So this could eliminate the traditional exposer processes but you would sill have all the rest of the wet process. See you Flo ------------------------------------------------------------------------------ Sponsored by Intel(R) XDK Develop, test and display web and hybrid apps with a single code base. Download it for free now! http://pubads.g.doubleclick.net/gampad/clk?id=111408631&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
