公开(公告)号：US07221627B2

公开(公告)日：2007-05-22

申请号：US10498763

申请日：2002-12-11

申请人： Jeroen Arnoldus Leonardus Johannes Raaymakers ,  Herman Petrus Van Der Kall

发明人： Jeroen Arnoldus Leonardus Johannes Raaymakers ,  Herman Petrus Van Der Kall

IPC分类号： G11B7/00

CPC分类号： G11B19/04 ,  G11B7/0948 ,  G11B7/0953 ,  G11B19/26

摘要： An optical playback or recording device is equipped with mass-unbalance detection means (20) for detecting unbalance on the record carrier (2). Mass-unbalance causes vibration and sound in the optical device when the record carrier (2) is rotated at a relatively high speed. When mass-unbalance is detected, the speed may be reduced to reduce the vibration and sound in the optical device. The mass-unbalance detection means (20) performs the following steps to detect mass-unbalance: a) determining the maximum value Umax1 of the actuator control signal (AS) at a rotational speed Ω1; b) determining the maximum value Umax2 of the actuator control signal (AS) at a rotational speed Ω2; c) comparing Formula (I) with Formula (II). If these values are substantially equal, then the effect of mass-unbalance is small, otherwise the effect of mass-unbalance is too great and the speed may have to be reduced U max ⁢ ⁢ 1 ω 1 2 ⁢ ⁢ with ⁢ ⁢ U max ⁢ ⁢ 2 ω 2 2 . ( I )

公开(公告)号：US06937426B2

公开(公告)日：2005-08-30

申请号：US10056143

申请日：2002-01-24

申请人： Herman Petrus Van Der Kall

发明人： Herman Petrus Van Der Kall

IPC分类号： G11B5/55 ,  G11B5/596 ,  G11B7/085 ,  G11B21/08

CPC分类号： G11B5/59611 ,  G11B7/08517 ,  G11B21/083

摘要： In a device (1) for reading and/or writing information from and on, a track on a medium (2), a read and/or write head (3) can be positioned with a positioning device (5, 20) relative to the medium (2). The read and/or write head (3) comprises a carriage (21) and means (22) for maintaining the reading and/or writing in a scanning point at the track during a transverse positioning of the track relative to the carriage (24). A control circuit (6) is present for controlling the positioning device (5, 20). There is a period of the order to magnitude of one millisecond between the supplying of a control signal to the positioning device (5, 20) at a first point in time based upon which the read and/or write head (3) has to be positioned and the actual start of the movement of the read and/or write head (3). The first point in time is before the point in time at which the maintaining means (22) reach the end of the track that is being read or written at the first point in time. The carriage (21) already moves at a certain velocity and has already been moved over a certain distance (D) when the maintaining means (22) reach the end of the track which is read or written.

摘要翻译： 在用于从介质（2）上的轨道读取和/或写入信息的设备（1）中，读取和/或写入头部（3）可以与定位设备（5,20）相对于 介质（2）。 读和/或写头（3）包括滑架（21）和用于在轨道相对于滑架（24）的横向定位期间保持在轨道处的扫描点的读取和/或写入的装置（22） 。 存在用于控制定位装置（5,20）的控制电路（6）。 在基于读取和/或写入头（3）必须是的位置的第一时间点，在向定位设备（5,20）提供控制信号之间存在一毫秒的幅度的周期 定位和读取和/或写入头（3）的移动的实际开始。 第一时间点在保持装置（22）到达在第一时间点被读取或写入的轨道的末端的时间点之前。 当保持装置（22）到达读取或写入的轨道的末端时，托架（21）已经以一定速度移动并且已经移动了一定距离（D）。