Patent Number: 6,167,008

Title: Skew detecting method and apparatus for optical disc

Abstract: A skew detecting method for easily performing a detection of a tangential skew occurring between a recording surface of an optical disc and a pickup with a high reliability. A reflection light when a reading beam is irradiated to the recording surface of the optical disc is received and converted into an electric signal. The electric signal is used as a read signal. An error value between each read sampling value in a read sample sequence obtained by sampling the read signal and a prediction value is obtained. The tangential skew is detected based on the error value when a polarity of the read sampling value obtained at a time point that is preceding to a time point when the error value is derived by a predetermined time and a polarity of the read sampling value obtained at a time point that is subsequent to the time point when the error value is derived by the predetermined time are different.

Inventors: Kuribayashi; Hiroki (Tsurugashima, JP)

Assignee: Pioneer Electronic Corporation

International Classification: G11B 20/18 (20060101); G11B 20/10 (20060101); G11B 7/095 (20060101); G11B 007/00 ()

Expiration Date: 12/26/2017