公开(公告)号：EP2360692A4

公开(公告)日：2014-08-27

申请号：EP09831663

申请日：2009-12-03

Applicant: PANASONIC CORP

Inventor： NAKAO MASAHITO ,  HINO YASUMORI ,  KOMMA YOSHIAKI ,  YAMASAKI FUMITOMO ,  SANO KOUSEI

IPC: G11B7/24038 ,  G11B7/005 ,  G11B7/007 ,  G11B7/125 ,  G11B7/1267

CPC classification number: G11B7/005 ,  G11B7/00736 ,  G11B7/1267 ,  G11B7/24038 ,  G11B2007/0013

Abstract: An information recording medium according to the present invention includes at least three information recording layers. If the readout power of a laser beam in reading information from an information recording layer L(n) is identified by Pw(n), and if the readout power of the laser beam in reading information from an information recording layer L(n+a) is identified by Pw(n+a), then a base thickness between the information recording layers is determined so that the intensity of the light when the information recording layer L(n+a) is irradiated with a laser beam having the readout power Pw(n) becomes equal to or lower than that of the light when the information recording layer L(n+a) is irradiated with a laser beam having the readout power Pw(n+a).