- Patent Title: Optical information recording medium having super-resolution film
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Application No.: US13702613Application Date: 2011-06-10
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Publication No.: US08699313B2Publication Date: 2014-04-15
- Inventor: Hideharu Tajima , Go Mori , Yasuhiro Harada , Masaki Yamamoto , Hirohisa Yamada , Masahito Konishi
- Applicant: Hideharu Tajima , Go Mori , Yasuhiro Harada , Masaki Yamamoto , Hirohisa Yamada , Masahito Konishi
- Applicant Address: JP Osaka JP Ibaraki
- Assignee: Sharp Kabushiki Kaisha,Memory-Tech Corporation
- Current Assignee: Sharp Kabushiki Kaisha,Memory-Tech Corporation
- Current Assignee Address: JP Osaka JP Ibaraki
- Agency: Keating & Bennett, LLP
- Priority: JP2010-134198 20100611
- International Application: PCT/JP2011/063405 WO 20110610
- International Announcement: WO2011/155608 WO 20111215
- Main IPC: G11B7/24
- IPC: G11B7/24

Abstract:
An optical information recording medium has a first information recording layer (20) and a second information recording layer (40) each of which includes (i) a group of pre-pits (31, 51) constituting marks (32, 52) and spaces (33, 53) and (ii) a super-resolution film (23, 43), the marks (32, 52) and the spaces (33, 53) having different lengths, an average length of a smallest mark that is smallest in length and a smallest space that is smallest in length being less than or equal to a resolution limit of a reproduction optical system for reproducing information recorded on the first information recording layer (20) and the second information recording layer (40), the group of pre-pits (31, 51) being formed so that a push-pull signal for the reproduction optical system to reproduce the information recorded by the group of pre-pits is negative in polarity. This provides an inexpensive and high-capacity multilayer optical information recording medium based on a super-resolution technology.
Public/Granted literature
- US20130142029A1 OPTICAL INFORMATION RECORDING MEDIUM Public/Granted day:2013-06-06
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