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公开(公告)号：EP0238055B1
公开(公告)日：1993-09-15
申请号：EP87103959.0
申请日：1987-03-18
CPC分类号： G11B11/10597 , G11B7/0045 , G11B7/08 , G11B7/0901 , G11B7/0903 , G11B7/0909 , G11B7/125 , G11B7/131 , G11B11/10519 , G11B11/10532 , G11B11/10576
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公开(公告)号：EP0238055A3
公开(公告)日：1989-06-14
申请号：EP87103959.0
申请日：1987-03-18
CPC分类号： G11B11/10597 , G11B7/0045 , G11B7/08 , G11B7/0901 , G11B7/0903 , G11B7/0909 , G11B7/125 , G11B7/131 , G11B11/10519 , G11B11/10532 , G11B11/10576
摘要： An erasing beam B1 and a recording beam B2 emitted from a laser diode array (20) are focused on different tracks of an optical magnetic disk D, the erasing beam B1 being focused on a track located ahead of a track on which the recording beam B2 is focused. The reflected beams of the erasing beam B1 and the recording beam B2 are separated respectively into two polarized components by means of a polarized beam splitter (17) and the polarized components are received by photo sensor means (23) and (24). Based on outputs of the photo sensor means (23) and (24), an address signal, a focus error signal and a tracking error signal are obtained. At the time of reproduction, the laser diode array (20) emits a reproducing beam so that the photo sensor means provide a reproduced signal.
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公开(公告)号：EP0238055A2
公开(公告)日：1987-09-23
申请号：EP87103959.0
申请日：1987-03-18
CPC分类号： G11B11/10597 , G11B7/0045 , G11B7/08 , G11B7/0901 , G11B7/0903 , G11B7/0909 , G11B7/125 , G11B7/131 , G11B11/10519 , G11B11/10532 , G11B11/10576
摘要： An erasing beam B1 and a recording beam B2 emitted from a laser diode array (20) are focused on different tracks of an optical magnetic disk D, the erasing beam B1 being focused on a track located ahead of a track on which the recording beam B2 is focused. The reflected beams of the erasing beam B1 and the recording beam B2 are separated respectively into two polarized components by means of a polarized beam splitter (17) and the polarized components are received by photo sensor means (23) and (24). Based on outputs of the photo sensor means (23) and (24), an address signal, a focus error signal and a tracking error signal are obtained. At the time of reproduction, the laser diode array (20) emits a reproducing beam so that the photo sensor means provide a reproduced signal.
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