公开(公告)号：US5164646A

公开(公告)日：1992-11-17

申请号：US665288

申请日：1991-03-05

申请人： Yuji Tawaragi ,  Satoshi Kusano ,  Toshio Suzuki ,  Noriko Obitsu

发明人： Yuji Tawaragi ,  Satoshi Kusano ,  Toshio Suzuki ,  Noriko Obitsu

IPC分类号： G11B7/085 ,  G11B7/09

CPC分类号： G11B7/0906 ,  G11B7/08517

摘要： A tracking servo system of disk player uses the time difference detection method for generating the tracking error signal. A time gate is provided for detecting the zero-crossing of the tracking error level in an on-track condition during a jumping operation. As the result, negative effects due to unstableness in timing of the zero-crossing can be eliminated.

公开(公告)号：US5471446A

公开(公告)日：1995-11-28

申请号：US664125

申请日：1991-03-04

申请人： Yuji Tawaragi ,  Satoshi Kusano ,  Toshio Suzuki ,  Noriko Obitsu

发明人： Yuji Tawaragi ,  Satoshi Kusano ,  Toshio Suzuki ,  Noriko Obitsu

IPC分类号： G11B7/095 ,  G11B7/09 ,  G11B7/00

CPC分类号： G11B7/09 ,  G11B7/0941 ,  G11B7/0943

摘要： An optical disk player having a tracking servo apparatus and a focusing servo apparatus. By amplifying a focusing error at a predetermined gain and adding it to a tracking error, the rolling which occurs due to a mass balance distortion of a pickup is electrically suppressed. Thus, an adverse influence on the tracking servo by the rolling upon focusing driving can be prevented.

摘要翻译： 一种具有跟踪伺服装置和聚焦伺服装置的光盘播放机。 通过以预定增益放大聚焦误差并将其加到跟踪误差中，由于拾取器的质量平衡失真而发生的滚动被电气地抑制。 因此，可以防止通过聚焦驱动时的滚动对跟踪伺服的不利影响。

公开(公告)号：US5130963A

公开(公告)日：1992-07-14

申请号：US660951

申请日：1991-02-26

申请人： Satoshi Kusano ,  Toshio Suzuki ,  Yuji Tawaragi ,  Noriko Obitsu

发明人： Satoshi Kusano ,  Toshio Suzuki ,  Yuji Tawaragi ,  Noriko Obitsu

IPC分类号： G11B7/095

CPC分类号： G11B7/0956

摘要： An optical disk player using quadrant type photodetector as light receiving means. The phase difference output by the time difference detection method is issued as a tracking error, and a DC component of differential output by the push-pull method is issued as a tilt error, and zero cross of said differential output is detected. By using this detection output for the detection of zero-cross timing on off-track, stable operation of the tracking servo unit is ensured.

公开(公告)号：US5206848A

公开(公告)日：1993-04-27

申请号：US658752

申请日：1991-02-21

申请人： Satoshi Kusano ,  Shinichi Takahashi ,  Toshio Suzuki ,  Yuji Tawaragi ,  Noriko Obitsu

发明人： Satoshi Kusano ,  Shinichi Takahashi ,  Toshio Suzuki ,  Yuji Tawaragi ,  Noriko Obitsu

IPC分类号： G11B7/09 ,  G11B7/095

CPC分类号： G11B7/0956 ,  G11B7/0906

摘要： An optical disk player provided with tilt servo unit. A quadrant type photodetector is used as disk tilt detecting means, and the push-pull output is issued as a disk tilt detecting signal. By simultaneous use of the photodetector of the pickup, there is no need to use special-purpose tilt sensor, and this contributes to compact design of the pickup and to the reduction of manufacturing cost.