Patent ID: 7787344
Filing Date: 2010-08-31
Classification: G11B

Abstract:
1. A writing device comprising: laser means for irradiating a beam of laser light with a laser drive pulse supplied to said laser means and forming, on a recording medium, a train of record data in the form of pits and lands between the pits; laser drive pulse generating means for generating a laser drive pulse corresponding to the record data; and waveform adjusting means including a first delay circuit for delaying the laser drive pulse using a high-frequency clock in sync with the laser drive pulse to provide a delay time in units of said high-frequency clock, a second delay circuit for delaying the laser drive pulse using multistage delay gates to provide a delay time shorter than the delay time provided by said first delay circuit, and a delay time control unit for variably controlling the delay time of said first delay circuit and the delay time of said second delay circuit, said waveform adjusting means delaying the whole or part of a waveform of the laser drive pulse generated by said laser drive pulse generating means and supplying, to said laser means, the laser drive pulse having been adjusted in the direction of the time base.