| 摘要 |
PURPOSE:To increase the amount of recorded information, by using a recording medium capable of changing the depth of pits depending on the amount of exposure for attaining multi-valued digital recording of ternary or more. CONSTITUTION:Laser light from a laser generator 1 is condensed on a recording layer 10 of a disc 9 via a mirror 2, an optical modulator 3, a mirror 5, a lens 6, a mirror 7, and an objective lens 8. The depth of pits is changed for the recording layer with the amount of exposure, allowing to record multi-valued digital signals of ternary or more. Thus, the amount of recorded information is increased in comparison with the recording of binary digital signals. |
