Patent ID: 6317405
Filing Date: 2001-11-13
Classification: G11B

Abstract:
A method of controlling light power to be used for recording on an optical disk, said method comprising the steps of:controlling a read control system and a write control system separately in such a manner that a level of read power to be used for reading out information from an optical disk and a level of write power to be used for writing information onto the optical disk approach their respective target values; andautomatically pre-calibrating a relationship between a control input to and a control output from said write control system, in order to provide an optimum write power level from the very beginning of recording,wherein said step of automatically pre-calibrating includes a step of, prior to initiation of recording operations, comparing a current control input to said read control system with a control input to said read control system in last calibration and a step of causing said write control system to execute automatic calibration of the relationship only when a difference between the control inputs is greater than a predetermined reference value.