发明申请
US20120236696A1 FOCUS SERVO CONTROL DEVICE, AND INFORMATION RECORDING/REPRODUCING DEVICE USING THE SAME
失效
聚焦伺服控制装置，以及使用其的信息记录/再现装置
- 专利标题： FOCUS SERVO CONTROL DEVICE, AND INFORMATION RECORDING/REPRODUCING DEVICE USING THE SAME
- 专利标题（中）： 聚焦伺服控制装置，以及使用其的信息记录/再现装置
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申请号： US13421503申请日： 2012-03-15
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公开(公告)号： US20120236696A1公开(公告)日： 2012-09-20
- 发明人: Takashi Usui , Kazuo Watabe , Hideaki Okano , Chikara Tanioka , Akihito Ogawa , Kazuaki Doi
- 申请人： Takashi Usui , Kazuo Watabe , Hideaki Okano , Chikara Tanioka , Akihito Ogawa , Kazuaki Doi
- 优先权： JP2011-059919 20110317
- 主分类号： G11B7/1374
- IPC分类号： G11B7/1374 ; G11B7/13
摘要：
A focus servo control device includes a first detector, first controller, second detector, and second controller. The first detector detects a first focus error signal. The first controller controls the objective lens based on the first focus error signal, so that a focal point of the first laser agrees with the guide layer. The second detector detects a second focus error signal. The second controller changes a relative distance between the focal point of the second laser and the focal point of the first laser, so that the focal point of the second laser agrees with a target recording/reproducing layer.