| 摘要 |
PURPOSE:To improve the recording density per an information track by multiple recording the signal of a low frequency such as a sound signal, etc., and the signal of a high frequency such as a video signal, etc. CONSTITUTION:One signal is recorded by a variation of a reflection factor having a further expanse in the width direction than width of a guide groove, and the other signal is recorded by a variation of a reflection in the guide groove. That is to say, in the part of a crystal state, information is recorded in a shape having an expanse in the width direction of a track, and also, in the guide groove 15, information is recorded in an amorphous state and multiplex recording is executed. Information being suitable for executing the recording in a shape having an expanse in the width direction of the track is a signal of a low frequency, and information being suitable for executing the recording in an amorphous state is a signal of a high frequency.
|
