Invention Grant
- Patent Title: Optical recording medium, and method and apparatus for optical recording and reproducing thereof
- Patent Title (中): 光记录介质及其光学记录和再现方法和装置
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Application No.: US11273390Application Date: 2005-11-15
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Publication No.: US07920454B2Publication Date: 2011-04-05
- Inventor: Hiroyuki Iwasa , Michiaki Shinotsuka , Masaru Shinkai
- Applicant: Hiroyuki Iwasa , Michiaki Shinotsuka , Masaru Shinkai
- Applicant Address: JP Tokyo
- Assignee: Ricoh Company, Ltd.
- Current Assignee: Ricoh Company, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Dickstein Shapiro LLP
- Priority: JP2003-138868 20030516; JP2004-028603 20040204
- Main IPC: G11B7/24
- IPC: G11B7/24

Abstract:
An optical recording medium wherein a laser beam at a wavelength λ is irradiated and recording and reproducing of information are performed by optical power modulation of binary or more, and when the refraction index of the first substrate being n1, the refraction index of the intermediate layer being n2, the groove depth, the groove width and the track pitch of the first information layer being d1, w1 and p1 respectively and the groove depth, the groove width and the track pitch of the second information layer being d2, w2 and p2 respectively, the following conditions are satisfied. 4λ/16n1≦d1≦7λ/16n1 λ/16n2≦d2≦3λ/16n2 or 4λ/16n2≦d2≦7λ/16n2 0.2≦w1/p1≦0.55 0.2≦w2/p2≦0.55
Public/Granted literature
- US20060098561A1 Optical recording medium, and method and apparatus for optical recording and reproducing thereof Public/Granted day:2006-05-11
Information query
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