Optical disc apparatus with selective track accessing using a correction

Abstract

An optical disc apparatus is disclosed, which comprises an optical head for obtaining an information signal from an optical disc through photoelectric conversion and an accessing section for moving the optical head to a position corresponding to a desired track of the optical disc. When the optical optical head is moved in a radial direction of the optical disc, the signal obtained therefrom is binarized by a binarization coder to obtain a binary pulse signal. Noise components contained in the binary pulse signal that are introduced from scars or scratches of the optical disc or dust particles attached thereto are removed from the binary pulse signal. Signal components corresponding to the innermost track of the optical disc are detected as a signal representing a reference position of the optical disc. A correction scale value is obtained from the difference between the reference position and an initial position of a scale of a position detector. An access position is determined from the correction scale value and designated track number.