| 摘要 |
PURPOSE:To record informations thermally in a rapid recording speed by a method wherein a laser beam modulated intensively by recording informations is irradiated concentratively to a recording medium provided with a thin film layer changed by heating and other concentrative laser beam is irradiated to a back side of the irradiating position. CONSTITUTION:On surfaces of recording mediums comprising providing a thin film layer 1B changed physically and chemically by heating and, according to necessity, a transparent protective film layer 1C on a base plate 1 transparent to a laser beam, a recording laser beam 2 modulated intensively by recording informations is concentratively irradiated and, at the same time, other concentrative laser beam 3 is irradiated to the position irradiated by the recording laser beam 2 from other side and the thin film layer 1B is changed by heating action to record informations. A recording arm 4 is branched into two portions and a recording medium 1D is moved so as to be interposed therebetween and semiconductive lasers LD1, LD2 are emitted and focussed by focussing lenses L3, L4 to irradiate a laser beam. |
