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Abstract

Abstract PURPOSE:To improve the moving accuracy of an optical system by eliminating an undesired low frequency component from a track difference signal by a filter means so as to attain stable binarization. CONSTITUTION:A high pass filter HPF is used to apply binarization while a low frequency component such as a DC component or the like is eliminated from a track difference signal. Thus, in moving an optical head H, even when an objective lens OBL is vibrated by external disturbance, it is not affected thereby. Moreover, a comparator circuit 19 is subject to setting of hysteresis, even when information is recorded on a track, binarizing error is prevented. Thus, stable binarization is attained and the moving accuracy of the optical system is improved.

Inventors

• 👤 Mikio Yamamuro

Bibliographic Details