Patent ID: 8098561
Filing Date: 2012-01-17
Classification: G11B

Abstract:
1. An optical disk device comprising: a laser light source that oscillates in a multimode; a first optical receiver circuit that receives a laser beam oscillated from the laser light source and generates a first electronic signal indicating an amount of light of the laser beam; an optical system that projects the laser beam to an optical disk; a second optical receiver circuit that receives an optical feedback from the optical disk and generates a second electronic signal indicating an amount of light of the optical feedback; a binarization circuit that extracts a band component corresponding to a predetermined frequency in the first electronic signal and binarizes the band component; a delay circuit that delays a phase of the binarized signal by time equivalent to a phase difference between the first electronic signal and the second electronic signal; and a sample hold circuit that samples and holds the second electronic signal in synchronization with the phase delayed signal.