发明授权
- 专利标题: Optical disc having protective cover
- 专利标题(中): 带保护罩的光盘
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申请号: US835927申请日: 1986-03-04
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公开(公告)号: US4672600A公开(公告)日: 1987-06-09
- 发明人: Neil K. Balston , Keith D. Anderson , Herman W. Willemsen
- 申请人: Neil K. Balston , Keith D. Anderson , Herman W. Willemsen
- 申请人地址: CAX Montreal
- 专利权人: Northern Telecom Limited
- 当前专利权人: Northern Telecom Limited
- 当前专利权人地址: CAX Montreal
- 主分类号: G06K7/10
- IPC分类号: G06K7/10 ; G11B7/24 ; G11B23/30 ; G11B27/19 ; G11B23/00 ; G11B7/00
摘要:
An optical disc assembly has an optical disc and a protective cover. The optical disc has a surface adapted to have optically recorded thereon data consisting of a series of laser ablated pits recorded as a series of concentric data tracks. The pits have small size and high surface density. The protective cover has a permanent optical recording at one surface thereof consisting of a series of visible marks. The marks are an order of magnitude larger than the pits and have a much lower surface density. Memory data is recorded on the optical disc and positional data, comprising a map of the memory data surface, is recorded on the cover. This allows the use of separate positional data and memory data monitoring channels which facilitates the recording of a blank optical disc and subsequent memory data access.
公开/授权文献
- US6056929A Method and apparatus for production of radioactive iodine 公开/授权日:2000-05-02