公开(公告)号：EP1091352A3

公开(公告)日：2003-07-09

申请号：EP00121303.2

申请日：2000-10-06

申请人： Pioneer Corporation

发明人： Abe, Shinichiro, Pioneer Corporation ,  Iijima, Takayuki, Pioneer Corporation

IPC分类号： G11B7/09 ,  G11B7/085

CPC分类号： G11B7/0945 ,  G11B7/0946 ,  G11B11/10576 ,  G11B11/10597

摘要： A focus servo control is performed by changing a condition of a focus servo loop from an open condition to a close condition in correspondence with a level of a reflection light signal, which is obtained as a reflection light of a light beam reflected from an information record medium is detected by a light receiving element such as an optical pickup. A focus servo controlling apparatus is provided with: a disturbance level detecting device such as a servo control circuit for detecting a level of a disturbance light signal, which is obtained as a disturbance light other than the reflection light is received by the light receiving element; and a controlling device such as a system controller for setting a level, which is larger than the level of the disturbance light signal detected by the disturbance level detecting device, as a threshold level and for changing the condition of the focus servo loop from the open condition to the close condition on the basis of a timing when the level of the reflection light signal becomes equal to or larger than the set threshold level.

摘要翻译： 通过将聚焦伺服环路的条件从打开状态改变为关闭状态，与作为从信息记录反射的光束的反射光获得的反射光信号的电平相对应地进行聚焦伺服控制 介质由诸如光学拾取器的光接收元件检测。 聚焦伺服控制装置具有：由光接收元件接收诸如用于检测作为除了反射光之外的干扰光获得的干扰光信号的电平的伺服控制电路的干扰电平检测装置; 以及诸如系统控制器的控制装置，用于将比由干扰电平检测装置检测到的干扰光信号的电平大的电平设置为阈值电平，并且用于将聚焦伺服环路的状态从开路 基于反射光信号的电平变为等于或大于设定的阈值电平的定时，使其处于关闭状态。

公开(公告)号：EP1091356A3

公开(公告)日：2002-11-20

申请号：EP00121305.7

申请日：2000-10-06

申请人： Pioneer Corporation

发明人： Abe, Shinichiro, Pioneer Corporation ,  Iijima, Takayuki, Pioneer Corporation ,  Yoshioka, Minoru, Pioneer Corporation

IPC分类号： G11B19/12 ,  G11B7/09

CPC分类号： G11B19/12 ,  G11B7/0941 ,  G11B11/10576 ,  G11B11/10595

摘要： A bias voltage controlling apparatus controls a bias voltage for a focus servo control to control a position of a focal point of a light beam, which is irradiated onto an information record surface of an information record medium (120), in a direction perpendicular to the information record surface. The bias voltage controlling apparatus is provided with: a distinguishing device (110) for distinguishing a type of the information record medium; and a controlling device (108) for optimally controlling the bias voltage on the basis of the type of the information record medium distinguished by the distinguishing device.