2004-095005 is referenced by 31 patents.

PROBLEM TO BE SOLVED: To provide an optical information recording medium capable of simplifying/accelerating data transfer/copy operations between a CD, a DVD and a Blu-ray Disk(BD) and recording and reproducing operations on the BD/DVD/CD by using a single disk drive device.SOLUTION: A first to third recording mediums 12 to 14 are mutually stacked successively from an incidence side of a light beam. If a laser beam 16 having a wavelength λ1 is focused on the first recording medium 12, the first recording medium 12 performs recording and reproduction, and the laser beam which is not focused is transmitted. If a laser beam 17 having a wavelength λ2 (≥λ1) is focused on the second recording medium 13, the second recording medium 13 performs recording and reproduction, and the laser beam which is not focused is transmitted. If a laser beam 18 having a wavelength λ3 (≥λ2) is focused on the third recording medium 14, third recording medium 14 can perform recording and reproduction.

Title
Optical information recording medium
Application Number
2002-251977
Publication Number
2004-095005
Application Date
August 29, 2002
Publication Date
March 25, 2004
Inventor
Takamori Nobuyuki
Assignee
Sharp
IPC
G11B 11/105
G11B 07/0045
G11B 07/24