公开(公告)号：US20180144772A1

公开(公告)日：2018-05-24

申请号：US15784142

申请日：2017-10-15

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Kohei NAKATA ,  Yoshihisa TAKAHASHI ,  Junichi MINAMINO

IPC: G11B20/18 ,  G11B20/00 ,  G11B7/24088

CPC classification number: G11B20/1883 ,  G11B7/00458 ,  G11B7/24088 ,  G11B20/00586 ,  G11B20/1879 ,  G11B20/1889

Abstract: The optical disk device performs recording/reproducing of data by a predetermined recording block on the track of an optical disk. The device has a recording unit, an optical-head, and a failure detection unit. The recording unit generates a recording signal by modulating the data. The optical-head records data on the track by optical beam emission to the track according to the recording signal, and detects light reflected off the track and then generates a detection signal based on the reflected light. The failure detection unit detects an abnormal condition based on the detection signal changed from a normal condition. If the sum of duration of an abnormal condition in the recording block is equal to or greater than a first time-length, the failure detection unit determines that the recording block has a flaw.

公开(公告)号：US20160163347A1

公开(公告)日：2016-06-09

申请号：US14958857

申请日：2015-12-03

Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

Inventor： Harumitsu MIYASHITA ,  Akihito YOSHIMI ,  Yoshihisa TAKAHASHI

IPC: G11B7/007

CPC classification number: G11B7/00375 ,  G11B7/0037 ,  G11B7/0079 ,  G11B7/08505 ,  G11B7/09 ,  G11B7/094 ,  G11B7/0945 ,  G11B7/095 ,  G11B7/268 ,  G11B19/041 ,  G11B19/048 ,  G11B2020/1242

Abstract: An information recording and playback device includes a recording and playback unit, and a controller. The controller divides a recording area of an optical disk into a first recording area which is at an inner circumference side, and a second recording area which is at an outer circumference side. The controller controls the recording and playback unit such that the unit records or plays back data in the first recording area at a first speed, and records or plays back data in the second recording area at a second speed slower than the first speed. The predetermined radius is set to a boundary between an area in which a control residual exceeds a predetermined reference value when servo control related to focusing and tracking is performed on the recording area of the optical disk, and an area in which the control residual does not exceed the predetermined reference value.

Abstract translation: 信息记录和重放装置包括记录和重放单元和控制器。 控制器将光盘的记录区域划分成内圆周侧的第一记录区域和位于外周侧的第二记录区域。 控制器控制记录和重放单元，使得单元以第一速度记录或重放第一记录区域中的数据，并以比第一速度慢的第二速度在第二记录区域中记录或重放数据。 当对光盘的记录区域执行与聚焦和跟踪相关的伺服控制时，将预定半径设置为控制剩余超过预定基准值的区域之间的边界，以及控制剩余不在 超过预定的参考值。