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1. 发明授权

US5627811A Constant linear velocity optical disk apparatus having improved circuitry for speed data access 失效
标题翻译：具有用于速度数据访问的改进电路的恒定线速度光盘装置
公开(公告)号：US5627811A
公开(公告)日：1997-05-06
申请号：US488658
申请日：1995-06-08
申请人： Tsutomu Morita , Hiroyuki Onda , Masasi Tanaka , Katsumi Aoyama
发明人： Tsutomu Morita , Hiroyuki Onda , Masasi Tanaka , Katsumi Aoyama
IPC分类号： G11B19/28 , G11B7/085 , G11B19/20 , G11B19/247 , G11B19/26 , G11B7/00
CPC分类号： G11B7/08505 , G11B19/2009 , G11B19/247 , G11B19/26
摘要： An optical disk apparatus includes a disk servo unit which generates a servo signal based on a data signal read from an optical disk. The servo signal is supplied to a disk motor to control a rotation of the motor so that a linear velocity of the disk is kept constant when data is read from or written onto the disk. The disk servo unit is connected to the motor when the data is read from or written onto the disk, so that the servo signal is supplied to the motor, and the disk servo unit is disconnected from the motor when a pickup jumps from a present track of the disk to a destination track thereof so that the supply of the servo signal to the motor is inhibited. A velocity change signal which enables the motor to increase or decrease a rotating speed of the motor is generated depending on which one of two directions of the track jump is specified by a direction signal. A time signal which defines an estimated time of the track jump required to change an angular velocity at the present track to an angular velocity at the destination track is generated. The optical disk apparatus supplies the velocity change signal to the motor during the estimated time.
摘要翻译：光盘装置包括：盘伺服单元，其基于从光盘读取的数据信号产生伺服信号。伺服信号被提供给盘马达，以控制马达的旋转，使得当数据从盘读取或写入盘时，盘的线速度保持恒定。当数据从盘读取或写入盘时，盘伺服单元连接到电动机，使得伺服信号被提供给电动机，并且当拾取器从当前轨迹跳跃时，盘伺服单元与电动机断开连接的磁盘到目标磁道，从而禁止向电机提供伺服信号。根据通过方向信号指定轨道跳跃的两个方向中的哪一个，使得电动机能够增大或减小电动机的转速的速度变化信号。产生定义将目前轨道处的角速度改变为目的地轨道的角速度所需的轨道跳跃的估计时间的时间信号。光盘装置在估计时间期间向马达提供速度改变信号。

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