Title:
情報記録媒体
Document Type and Number:
Japanese Patent JP2529133
Kind Code:
B2
Abstract:
PURPOSE:To improve focusing, and to prevent the generation of the read error of a signal by forming a peripheral section on the bit region side of a recording layer in a bit region while crossing the boundaries of a group region and the bit region. CONSTITUTION:An information recording medium is composed of a discoid substrate 1, a recording layer 2 formed on the outer circumferential side of the substrate 1 and consisting of a dyestuff, a reflecting layer 3 formed onto the substrate and the recording layer 2, and a protective layer 4 shaped onto the reflecting layer 3, and has a bit region 5, in which bits as recording signals are formed onto the substrate 1, and a group region 6, in which groups are formed onto the substrate 1 and the recording layer 2 is shaped onto the groups and which can record information. The bits 8, to which information is recorded, are formed in the bit region 5 and pre-groups 9 for guiding a laser for recording in the group region 6. There is the swelling peripheral section of the recording layer 2 formed in the bit region 5. Accordingly, focusing is improved, and the generation of the read error of a signal is prevented.
Inventors:
沢野 充
Application Number:
JP30685090A
Publication Date:
August 28, 1996
Filing Date:
November 13, 1990
Export Citation:
Assignee:
富士写真フイルム株式会社
International Classes:
G11B7/24035; G11B7/246; (IPC1-7): G11B7/24
Attorney, Agent or Firm:
柳川 泰男