Patent ID: 7630285
Filing Date: 2009-12-08
Classification: G11B

Abstract:
1. An optical writing device comprising: wobble signal generation means for generating a wobble signal from an electric signal outputted from an optical pickup; evaluation means for evaluating accuracy of the wobble signal generated by said wobble signal generation means; and control means for allowing control, in performing writing to an optical disk, for interrupting a writing operation when the accuracy of the wobble signal evaluated by said evaluation means is deviated from a predetermined range wherein said control means performs control, in performing writing, for interrupting the writing operation, decelerating a writing speed, and restarting the writing operation, when deciding that the accuracy of the wobble signal evaluated by said evaluation means is lower than a lower limit of the predetermined rang % and said control means performs control for interrupting the writing operation, accelerating the writing speed, and restarting the writing operation, when deciding that the accuracy of the wobble signal is higher than an upper limit of the predetermined range wherein a synchronization signal for frame synchronization with writing data is added to the wobble signal and phase error measurement means for measuring a phase error between the synchronization signal and a synchronization signal of the writing data is further provided; and said evaluation means evaluates the accuracy of the wobble signal at least based on the phase error measured by said phase error measurement means.