发明授权
- 专利标题: Optical recording track access driving apparatus
- 专利标题(中): 光记录轨道存取驱动装置
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申请号: US923745申请日: 1992-07-28
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公开(公告)号: US5335214A公开(公告)日: 1994-08-02
- 发明人: Hirotsugu Matoba , Masaru Nomura , Takeshi Yamaguchi
- 申请人: Hirotsugu Matoba , Masaru Nomura , Takeshi Yamaguchi
- 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: JPX3-194336 19910802
- 主分类号: G11B7/085
- IPC分类号: G11B7/085 ; G11B21/08 ; G11B7/09
摘要:
An optical recording medium driving apparatus has the first high-pass filter for outputting a low frequency component removed signal by removing a low frequency component from a reproduction signal varying depending on a reflected light beam from the optical recording medium. The low frequency component removed signal changes due to transient response just after an access operation starts. Zero voltage is inputted to the second high-pass filter during a tracking operation while a voltage having a negative polarity which is substantially the same amplitude as the AC component of the low frequency component removed signal is inputted to the second high-pass filter. The first high-pass filter has the same time constant as the second high-pass filter. Just after the access operation starts, the negative voltage has the same transient response as the output of the first high-pass filter. The output of the first high-pass filter is compared to the output of the second high-pass filter in order to have a binary signal of the binary logic condition. A land is discriminated from a groove according to the binary signal, thereby enabling to access a target track in accuracy.
公开/授权文献
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