CD disc, CD disc recording device and method, and device and method for reproducing

Application Number: 00105356
Application Date: 2000.03.30
Publication Number: 1268737
Publication Date: 2000.10.04
Priority Information: 1999/3/30 JP 088293/99
International: G11B7/00
Applicant(s) Name: Sony Corp.
Inventor(s) Name: Yamamoto Shinnobu;Ohayashi Seishi
Patent Agency Code: 31100
Patent Agent: hong ling
Abstract An optical disk recording apparatus, an optical disk recording method, an optical disk playback apparatus, and an optical disk playback method are provided. For example, the present invention is applied to a high-sound-quality optical disk which can be played back by a conventional compact disk player, and aims at supplying still higher-quality contents which can be played back even by a conventional optical disk apparatus. Second information is recorded by partial changes of optical characteristics, such changes being of such a degree which does not affect detection results of first and second areas which are detected by the irradiation of a laser beam.