An unheated cutting stylus is positioned with respect to a metal master in order to cut a groove having a quiescent groove depth less than one micrometer while relative motion is established between the cutting stylus and the metal master. The cutting stylus is vibrated about the quiescent position thereof...http://www.google.fr/patents/US4044379?utm_source=gb-gplus-shareBrevet US4044379 - Method and apparatus for electromechanical recording of short wavelength modulation in a metal master
Method and apparatus for electromechanical recording of short wavelength ...
