Invention Grant
- Patent Title: Information recording medium, recording apparatus, reproducing apparatus and reproducing method
- Patent Title (中): 信息记录介质,记录装置,再现装置和再现方法
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Application No.: US12745086Application Date: 2009-11-19
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Publication No.: US08259556B2Publication Date: 2012-09-04
- Inventor: Tomoyasu Takaoka , Shigeru Furumiya , Naoyasu Miyagawa
- Applicant: Tomoyasu Takaoka , Shigeru Furumiya , Naoyasu Miyagawa
- Applicant Address: JP Osaka
- Assignee: Panasonic Corporation
- Current Assignee: Panasonic Corporation
- Current Assignee Address: JP Osaka
- Agency: Renner, Otto, Boisselle & Sklar, LLP
- Priority: JP2008-301463 20081126
- International Application: PCT/JP2009/006251 WO 20091119
- International Announcement: WO2010/061557 WO 20100603
- Main IPC: G11B7/24
- IPC: G11B7/24 ; G11B7/00

Abstract:
An information recording medium, comprising N number (N is an integer fulfilling N≧3) of information layers on which information is recordable, and allowing information to be recorded on each of the information layers and allowing information recorded on each of the information layers to be reproduced by being irradiated with laser light. The N number of information layers include an N'th information layer, an (N−1)th information layer, an (N−2)th information layer, . . . a second information layer and a first information layer sequentially located from a laser light incidence side. A reflectance of the N'th information layer is RN, and a reflectance of an M'th information layer (M refers to every integer fulfilling N>M≧1) is RM. The laser light used to irradiate the N'th information layer for reproducing information recorded on the N'th information layer has an upper limit reproduction power PrNmax, and the laser light used to irradiate the M'th information layer for reproducing information recorded on the M'th information layer has an upper limit reproduction power PrMmax. The following expressions (1) and (2) are concurrently fulfilled: RN>RM (1) PrNmax
Public/Granted literature
- US20100302921A1 INFORMATION RECORDING MEDIUM, RECORDING APPARATUS, REPRODUCING APPARATUS AND REPRODUCING METHOD Public/Granted day:2010-12-02
Information query
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