Optical information recording method.

摘要

In a method of recording an information signal by using a single light beam on a recording medium (1) which is changeable between first and second states which are optically distinguishable from each other, record marks are formed each by application of the light beam for a predetermined duration to cause the recording medium (3) to melt and the first state. To an area between the second marks is applied the light beam after having been modified to have a reduced energy to cause the area to melt and become a state substantially identical to the second state, whereby the record marks can be read highly reliably. In another aspect, each record mark is formed in a symmetrical shape by application of a train of light pulses providing an energy gradually reduced from the beginning to the ending of the predetermined duration.