Patent ID: 7161886
Filing Date: 2007-01-09
Classification: G11B

Abstract:
1. An optical disc identification method for identifying the type of an optical disc in an optical disc reproduction system, wherein the optical disc reproduction system comprises a pickup, the pickup comprising a first light source and a second light source, the optical disc identification method comprising: (a) measuring a first time needed for the focus of the first light source to move from a plastic layer to a reflection layer of the optical disc; (b) measuring the characteristics of a focus error signal while the focus of the first light source is moving in the reflection layer of the optical disc; (c) measuring the characteristics of the focus error signal while the focus of the second light source is moving in the reflection layer of the optical disc; (d) combining the result measured in step (c) with the first time to determine a first judging value, and combining the result measured in step (b) with the first time to determine a second judging value; and (e) identifying the type of the optical disc according to at least the first judging value and the second judging value.