Invention Grant
- Patent Title: Optical recording medium driving apparatus capable of accurately detecting position of optical head
- Patent Title (中): 光学记录介质驱动装置能够精确地检测光学头的位置
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Application No.: US910838Application Date: 1992-07-08
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Publication No.: US5459705APublication Date: 1995-10-17
- Inventor: Hirotsugu Matoba , Hiroshi Fuji , Kunio Kojima
- Applicant: Hirotsugu Matoba , Hiroshi Fuji , Kunio Kojima
- Applicant Address: JPX Osaka
- Assignee: Sharp Kabushiki Kaisha
- Current Assignee: Sharp Kabushiki Kaisha
- Current Assignee Address: JPX Osaka
- Priority: JPX3-167195 19910708
- Main IPC: G11B7/00
- IPC: G11B7/00 ; G11B7/005 ; G11B7/007 ; G11B7/085 ; G11B7/09 ; G11B21/08 ; G11B7/08
Abstract:
In an optical recording medium driving apparatus, only a frequency component corresponding to pits of an ID portion is detected from a total signal representing a total amount of reflected light from an optical disc by a high pass filter. With this frequency component clamped so that a potential at a maximum point becomes a definite potential, a changed amount of light of the total signal corresponding to pits is detected and a phase pit signal is generated. In response to this phase pit signal, a signal component corresponding to pits is removed from the total signal, thereby generating a pit removal signal.
Public/Granted literature
- US4685793A Image forming apparatus Public/Granted day:1987-08-11
Information query
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