公开(公告)号：EP1438717A1

公开(公告)日：2004-07-21

申请号：EP02777849.7

申请日：2002-10-16

申请人： Koninklijke Philips Electronics N.V. ,  Matsushita Electric Industrial Co., Ltd. ,  Sony Corporation

发明人： HEEMSKERK, Jacobus, Petrus Josephus ,  SCHEP, Cornelis, Marinus ,  STEK, Aalbert ,  FURUMIYA, Shigeru ,  ISHIBASHI, Hiromichi ,  MINAMINO, Junichi ,  OGAWA, Hiroshi,SONY CORPORATION ,  MASUHARA, Shin,SONY CORPORATION ,  SANO, Tatsushi,SONY CORPORATION

IPC分类号： G11B7/007 ,  G11B7/26

CPC分类号： G11B7/007 ,  G11B7/24082 ,  G11B27/24 ,  G11B2220/216 ,  G11B2220/218 ,  G11B2220/2529 ,  G11B2220/2545 ,  G11B2220/2562 ,  G11B2220/2575

摘要： The S/N ratio is improved for recording data to grooves (2-1, 2-2) of an optical disc so that as much information as possible can be recorded at the lowest possible frequency band. An optical disc using wobble patterns to record different information has a first groove (2-1) having a first wobble pattern (22) in which one wobble period has a sharp rising edge and a gradual falling edge; and a second groove (2-2) having a second wobble pattern (24) in which one wobble period has a gradual rising edge and a sharp falling edge. Each of the first and the second wobble pattern is represented by a first fundamental and a second harmonic of a Fourier series. The polarity of the second harmonic, which is an even harmonic, of the second wobble pattern is opposite that of the first wobble pattern. A method for manufacturing this optical disc is also provided.