Invention Grant
- Patent Title: Optical information recording medium, recording and readout methods using the same, optical information recording device, and optical information readout device
- Patent Title (中): 光信息记录介质,使用其的记录和读出方法,光信息记录装置和光信息读出装置
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Application No.: US10804328Application Date: 2004-03-18
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Publication No.: US07682678B2Publication Date: 2010-03-23
- Inventor: Nobuyuki Takamori , Hideharu Tajima , Go Mori , Masaki Yamamoto
- Applicant: Nobuyuki Takamori , Hideharu Tajima , Go Mori , Masaki Yamamoto
- Applicant Address: JP Osaka-Shi
- Assignee: Sharp Kabushiki Kaisha
- Current Assignee: Sharp Kabushiki Kaisha
- Current Assignee Address: JP Osaka-Shi
- Agency: Edwards Angell Palmer & Dodge, LLP
- Agent David G. Conlin; Jonathan M. Sparks
- Priority: JP2003-162871 20030606
- Main IPC: B32B3/02
- IPC: B32B3/02

Abstract:
An optical information recording medium includes a substrate formed in a concave-convex state by providing pits or grooves corresponding to recorded information, used for optically reproducing the information by irradiation of a light beam, and may also include a recording layer. The optical information recording medium includes a temperature responsive layer 21 whose reflectance and/or transmittance for the light beam changes with an increase in temperature caused by the irradiation of a light beam and a light absorption layer 22. With such an arrangement, the present invention provides an optical information recording medium enabling secure and highly accurate readout of information recorded with high density, a recording method and a readout method using the same, a readout device, and a recording device.
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