Patent ID: 6414916
Filing Date: 2002-07-02
Classification: G11B

Abstract:
A recording apparatus of a master disc of optical discs comprising:rotation driving means for rotating a master disc of optical discs; reference signal generating means for supplying a reference pulse signal to control a rotational speed of said master disc of optical discs to said rotation driving means; angle pulse generating means for generating an angle pulse signal every predetermined angle in a rotating direction of said master disc of optical discs; angle position calculating means for calculating an angle position in the rotating direction of said master disc of optical discs based on said angle pulse signal; irradiating means for irradiating a recording beam onto said master disc of optical discs based on an information recording signal; and irradiating position control means for controlling an irradiating spot position of said recording beam on said master disc of optical discs, wherein said irradiating position control means comprises phase difference signal generating means for generating a phase difference signal according to a phase difference between a phase of said reference pulse signal and a phase of said angle pulse signal, deviation phase difference calculating means for calculating a present deviation phase difference at a present angle position from a reference phase difference based on said angle pulse signal and said phase difference signal, and irradiating position adjusting means for adjusting said irradiating spot position based on said present deviation phase difference.