Optical information recording method

摘要

In a method of recording an information signal by using a single light beam on a recording medium which is changeable between first and second states which are optically distinguishable from each other, record marks are formed each by the application of the light beam for a predetermined duration to cause the recording medium to melt and thereby result in the first state. The light beam is applied to an area between the record marks after having been modified to have a reduced energy so as to cause the area to melt and result in 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 the application of a train of light pulses providing an energy level which is gradually reduced from the beginning to the ending of the predetermined pulse train duration.