Title:
OPTICAL MEMORY
Document Type and Number:
Japanese Patent JP2693289
Kind Code:
B2
Abstract:
PURPOSE: To improve recording density while securing C/N by obtaining a track cross signal having sufficient strength which permits accurate access even if a track pitch is set to be about 1.4μm and also preventing reflectivity on a land 3 from decreasing.
CONSTITUTION: The width of a group 2 formed on a transparent substrate of an optical memory 15 is set to be 0.3-0.4μm and the depth of the group 2 is set to be 80-100nm, and further, the allowable maximum decreasing amount in the width direction at the corner part of the land 3 is set to be 0.2μm.
More Like This:
Inventors:
Tetsuya Inui
Akira Takahashi
Kenji Ota
Rinobu Saegusa
Yoshiteru Murakami
Akira Takahashi
Kenji Ota
Rinobu Saegusa
Yoshiteru Murakami
Application Number:
JP20032791A
Publication Date:
December 24, 1997
Filing Date:
August 09, 1991
Export Citation:
Assignee:
Sharp Corporation
International Classes:
G11B7/007; G11B7/2405; G11B7/2407; G11B7/24073; G11B7/24076; G11B7/24079; G11B7/24085; G11B7/2534; G11B7/26; G11B11/105; G11B7/0045; G11B7/09; (IPC1-7): G11B7/24
Attorney, Agent or Firm:
Kenzo Hara
Previous Patent: TAPE TRAVELING MECHANISM FOR MAGNETIC RECORDING AND REPRODUCING DEVICE
Next Patent: STRUCTURE OF PLURAL-FLOOR BUILDING
Next Patent: STRUCTURE OF PLURAL-FLOOR BUILDING