Invention Grant
- Patent Title: Optical recording medium and method for reproducing the same
- Patent Title (中): 光记录介质及其再现方法
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Application No.: US12451526Application Date: 2008-04-16
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Publication No.: US08238214B2Publication Date: 2012-08-07
- Inventor: Koji Mishima , Tsutomu Aoyama , Takashi Kikukawa
- Applicant: Koji Mishima , Tsutomu Aoyama , Takashi Kikukawa
- Applicant Address: JP Tokyo
- Assignee: TDK Corporation
- Current Assignee: TDK Corporation
- Current Assignee Address: JP Tokyo
- Agency: Oliff & Berridge, PLC
- Priority: JP2007-133279 20070518; JP2007-219462 20070827
- International Application: PCT/JP2008/057422 WO 20080416
- International Announcement: WO2008/142928 WO 20081127
- Main IPC: G11B7/00
- IPC: G11B7/00

Abstract:
An optical recording medium which includes three or more information layers and has a higher stack density of information layers than before in the direction of thickness while reducing crosstalk during reproduction, and a method for reading the optical recording medium are provided. The optical recording medium has a three-layer structure which includes a substrate, a first information layer, a first spacer layer, a second information layer, a second spacer layer, a third information layer, and a cover layer thinner than the substrate, with these layers being stacked in that order over the substrate, wherein the following Equation (I) is satisfied: (R2×R3×R2)/R1≦0.0032 Equation (I) where R1 is the reflectivity of the first information layer, R2 is the reflectivity of the second information layer, and R3 is the reflectivity of the third information layer, and the first spacer layer and the second spacer layer are equal to each other in thickness.
Public/Granted literature
- US20100074084A1 OPTICAL RECORDING MEDIUM AND METHOD FOR REPRODUCING THE SAME Public/Granted day:2010-03-25
Information query
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