Patent ID: 6407968
Filing Date: 2002-06-18
Classification: G11B

Abstract:
An optical information recording/reproducing device for recording/reproducing information by converging light on a recording medium including land sections and groove sections and detecting a light reflected therefrom using an optical pickup, comprising:offset amount detection means for detecting focus offset amounts, said offset amount detection means including sampling circuitry which detects the focus offset amounts in response to a tracking error signal by sampling the respective levels of a focus error signal when a light spot is on a center of a land section while crossing a land section/groove section boundary and when a light spot is on a center of a groove section while crossing a land section/groove section boundary, and focus error signal compensation means for compensating the focus error signal based on the respective focus offset amounts detected by said offset amount detection means, to thereby obtain respective optimal focus positions for the land sections and the groove sections.