Patent ID: 6072761
Filing Date: 2000-06-06
Classification: G11B

Abstract:
An optical storage apparatus comprising:a laser diode for emitting a light beam;a light emission current source circuit for supplying driving currents according to a plurality of powers to said laser diode;an automatic power control unit for controlling a light emitting power of said laser diode to a specified target power;a monitoring detector for receiving a laser beam from said laser diode and detecting a measuring power;a monitoring power measuring unit for obtaining a monitor current derived from said monitoring detector as a power measurement value;a light emission fine adjustment processing unit for supplying a light emitting current of a predetermined testing power to said laser diode in a state where an on-track control is validated after seeking to a predetermined test zone, for driving said laser diode to emit light, for adjusting said light emitting current so that said measuring power is equal to said target power, and for obtaining a relation between said light emitting current and said target light emitting power on the basis of said adjustment result; anda test zone confirming unit for discriminating whether a present position of the light beam lies within a range of said test zone or not at the time of the start of the light emission adjustment of said laser diode by said light emission fine adjustment processing unit and for activating said light emission adjustment when the present position lies within said test zone range.