ERROR SIGNAL DETECTOR FOR OPTICAL RECORDER-REPRODUCER, AND REPRODUCING SIGNAL DETECTOR

摘要

PROBLEM TO BE SOLVED: To provide an error signal detector which is used for an optical recorder-reproducer to detect tracking and/or tilting error signals with high accuracy by making the best use of the phase characteristics by the light areas which are reflected/diffracted on a recording medium. SOLUTION: This detector has an information signal detecting light detector that receives the light which are reflected/diffracted on a recording medium and a circuit part which calculates the detection signal of the light detector and detects an error signal. The light detector includes eight light receiving areas of a (2×4) matrix array where the row and column directions are set almost in parallel to the directions corresponding to the radial and tangential directions respectively so that the light which are reflected/diffracted on the recording medium and received undergo the photoelectric conversion independently of each other. The circuit part compares the phases of detection signals of the inside and/or outside light receiving areas which are positioned in the same row and then obtains the tilting and/or tracking error signals from the phase comparison signals.