公开(公告)号：US06392971B1

公开(公告)日：2002-05-21

申请号：US09268982

申请日：1999-03-16

申请人： Taizo Takiguchi ,  Yoshimasa Sato ,  Koso Kashima ,  Kenji Yamazaki

发明人： Taizo Takiguchi ,  Yoshimasa Sato ,  Koso Kashima ,  Kenji Yamazaki

IPC分类号： G11B700

CPC分类号： G11B7/094 ,  G11B7/0945 ,  G11B11/10576

摘要： Test pattern data is recorded on a track of the optical disc, and the other pattern data is recorded on the neighboring track. A focus bias value providing the minimum jitter amount when the test pattern data is reproduced with varying the focus bias, is obtained. Just focusing condition is attained by the focus servo using the focus bias. When the test pattern data is reproduced, the data of these neighboring track is also reproduced simultaneously because the pattern data of the type different from the test pattern data is also recorded on the neighboring track. Particularly, under the defocusing condition, crosstalk amount becomes larger because the beam shape is distorted. With reference to jitter amount, such a mistake that the defocusing condition is erroneously determined as the just focusing condition can be eliminated. That is, the focus servo signal providing the accurate just focusing condition can be obtained.

摘要翻译： 测试图案数据被记录在光盘的轨道上，而另一个图案数据被记录在相邻的轨道上。 获得当通过改变聚焦偏压再现测试图案数据时提供最小抖动量的聚焦偏置值。 通过使用聚焦偏置的聚焦伺服来达到聚焦条件。 当再现测试图案数据时，由于与测试图案数据不同的类型的图案数据也被记录在相邻的轨道上，所以这些相邻轨迹的数据也被同时再现。 特别地，在散焦条件下，由于光束形状失真，串扰量变大。 关于抖动量，可以消除将散焦条件错误地确定为刚刚聚焦条件的错误。 也就是说，可以获得提供准确的聚焦条件的聚焦伺服信号。