发明授权
- 专利标题: Optical memory disc
- 专利标题(中): 光存储盘
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申请号: US671865申请日: 1984-11-15
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公开(公告)号: US4658393A公开(公告)日: 1987-04-14
- 发明人: Kenji Ohta , Akira Takahashi , Tetsuya Inui , Takao Hyuga , Hideyoshi Yamaoka
- 申请人: Kenji Ohta , Akira Takahashi , Tetsuya Inui , Takao Hyuga , Hideyoshi Yamaoka
- 申请人地址: JPX Osaka
- 专利权人: Sharp Kabushiki Kaisha
- 当前专利权人: Sharp Kabushiki Kaisha
- 当前专利权人地址: JPX Osaka
- 优先权: JPX58-178224[U] 19831117
- 主分类号: G11B7/24
- IPC分类号: G11B7/24 ; G11B7/26 ; G11B23/00 ; G11B3/70
摘要:
An optical memory disc includes a glass substrate on which a plurality of concentric circular guide grooves (or a spiral groove) are formed for tracking purposes. A centering plate is secured to the glass substrate in a manner that the center of a circular opening formed in the centering plate is exactly adjusted to the center of the plurality of concentric circular guide grooves (spiral groove). The circular opening formed in the centering plate is utilized to drive the optical memory disc on a turntable. Since the circular opening is not formed directly in the glass substrate, the center adjustment is easily conducted, and there is no possibility that the glass substrate is damaged when the circular opening is formed.