Patent ID: 7313075
Filing Date: 2007-12-25
Classification: G11B

Abstract:
1. A method of optically recording information on a recording medium, comprising: irradiating the recording medium with an irradiation light of a recording power to form a recorded-mark on the recording medium such that a reflection coefficient from an area of the recorded-mark is different than a reflection coefficient from an area of the recording medium where the recorded-mark is not formed; modulating the irradiation light according to the information for recording to form the recorded-mark on the recording medium by changing the power of the irradiation light between the recording power and a non-recording power; receiving a reflection light of the irradiation light reflected by the recording medium and producing a corresponding light signal; determining the quality of formation of the recorded-mark based upon the light signal produced during a predetermined period of time immediately after power of the irradiation light changes from the recording power to the non-recording power; forming a plurality of test recording marks with a varied irradiation power on a predetermined area of the recording medium; receiving reflection light of the irradiation light reflected by the plurality of test recording marks and producing corresponding test light signals; storing in association each irradiation power and related test light signal; determining an optimum pair of irradiation power and related test light signal as a control target value; and controlling the recording power of the irradiation light according to the quality of the recorded-mark such that a value of the produced light signal becomes equivalent to the control target value.