- 专利标题: Optical recording medium and disc cartridge having 2 GB capacity
- 专利标题(中): 光记录介质和光盘盒
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申请号: US10051775申请日: 2001-10-29
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公开(公告)号: US06704275B2公开(公告)日: 2004-03-09
- 发明人: Naohiro Netsu , Yoshitaka Aoki , Tetsu Watanabe , Kazuhiko Fujiie , Yasuaki Maeda , Takuya Kaeriyama
- 申请人: Naohiro Netsu , Yoshitaka Aoki , Tetsu Watanabe , Kazuhiko Fujiie , Yasuaki Maeda , Takuya Kaeriyama
- 优先权: JPP11-176029 19990622
- 主分类号: G11B2303
- IPC分类号: G11B2303
摘要:
An optical recording medium is provided which has a substrate and a signal recording layer provided on the substrate and in which an information signal is recorded in the form of microscopic pits. A light beam is focused on the signal recording layer and some change of the light beam carried by a return light from the signal recording layer is detected to read the information signal recorded on the signal recording layer. The optical recording medium has a diameter of 65 mm or less and thickness of 0.4 to 0.7 mm. An information signal recording area extends outwardly from a radial position of 12.5 mm or less from the center of the medium. The ratio in area between the information signal recording area and non-signal recording area is 3.4 or more. The storage capacity of this medium is 2 gigabytes or more. The optical recording medium has formed at the center thereof a center hole around which an annular table-abutment convexing to one side of the medium is formed. A magnetic-clamping hub is installed in the center hole and thus the medium is magnetically clamped to a rotation driving mechanism of an optical recording and/or reproducing apparatus. The compactness and high density of recording of the optical recording medium will contribute greatly to a further compact structure of a recording and/or reproducing apparatus in which the medium is to be used.
公开/授权文献
- US20020071383A1 Optical recording medium and disc cartridge 公开/授权日:2002-06-13