Patent ID: 6167008
Filing Date: 2000-12-26
Classification: G11B

Abstract:
An optical disc skew detecting method of for detecting a tangential skew occurring between a pickup and a recording surface of an optical disk, said pickup receiving a reflection light when a reading beam is irradiated onto the recording surface of the optical disc and converting the reflection light into an electric signal and obtaining the electric signal as a read signal, said method comprising the steps of:obtaining an error value between each read sampling value and a prediction value in a read sample sequence obtained by sampling said read signal; anddetecting said tangential skew on the basis of said error value when a polarity of the read sampling value obtained at a time point that is preceding to a time point when said 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 said error value is derived by said predetermined time are different.