Patent ID: 7426174

Claim:
An information recording method for recording information to a medium by irradiating the medium with a laser beam and applying an electric current to the medium, said medium comprising a first recording layer including electro-chromic material and a pair of electrodes, said first recording layer disposed between the pair of electrodes, said medium having a land area and a groove area in a radial direction of said medium, the information recording method, comprising steps of: applying a controlled voltage to said electrodes so as to develop color of said land area of said first recording layer and suppress color development of said groove area of said first recording layer; and recording marks by irradiating said first recording layer with a laser beam having predetermined power so as to weaken electrochromic property of said first recording layer, wherein a thickness of the first recording layer in said land area is thinner than a thickness of the first recording layer in said groove area.